diff --git a/Sources/removemacai/App/AppModel.swift b/Sources/removemacai/App/AppModel.swift
index 7265409..82acb3e 100644
--- a/Sources/removemacai/App/AppModel.swift
+++ b/Sources/removemacai/App/AppModel.swift
@@ -49,6 +49,8 @@ final class AppModel {
 
   // What the person wants.
   var wanted: Set<String> = []
+  /// Tweaks the person switched, so a partly applied one is only undone on request.
+  var touched: Set<String> = []
   var aiOff = false
   var aiKept: Set<String> = []
 
@@ -88,6 +90,7 @@ final class AppModel {
     journal = Engine.loadJournal()
     if resetChoices {
       wanted = Set(states.filter { $0.value == .applied }.map(\.key))
+      touched = []
       aiOff = currentAI != nil
       aiKept = snapshot.profile.ai ? snapshot.profile.kept : []
     }
@@ -127,9 +130,24 @@ final class AppModel {
   func isOn(_ tweak: Tweak) -> Bool { wanted.contains(tweak.id) }
 
   func toggle(_ tweak: Tweak, _ on: Bool) {
+    guard wanted.contains(tweak.id) != on else { return }
+    touched.insert(tweak.id)
     if on { wanted.insert(tweak.id) } else { wanted.remove(tweak.id) }
   }
 
+  /// Drops any choice made for the tweak, so it stays as it is on the Mac.
+  func leave(_ tweak: Tweak) {
+    wanted.remove(tweak.id)
+    touched.remove(tweak.id)
+  }
+
+  /// Whether leaving the tweak unwanted undoes it.
+  func undoes(_ tweak: Tweak) -> Bool {
+    let s = state(tweak)
+    guard !wanted.contains(tweak.id), s != .notApplied, s != .managed, s != .unsupported else { return false }
+    return s != .partial || touched.contains(tweak.id)
+  }
+
   func choose(_ preset: Preset) {
     wanted.formUnion(Tweaks.preset(preset).map(\.id))
     aiOff = true
@@ -143,9 +161,8 @@ final class AppModel {
     Tweaks.all.compactMap { t in
       let s = state(t)
       guard s != .managed && s != .unsupported else { return nil }
-      let want = wanted.contains(t.id)
-      if want && s != .applied { return (t, true) }
-      if !want && s != .notApplied { return (t, false) }
+      if wanted.contains(t.id) && s != .applied { return (t, true) }
+      if undoes(t) { return (t, false) }
       return nil
     }
   }
@@ -157,7 +174,7 @@ final class AppModel {
 
   func discard() { reload(resetChoices: true) }
 
-  func plan() -> Plan { Plan.make(wanted: wanted, ai: targetAI, snapshot: snapshot) }
+  func plan() -> Plan { Plan.make(wanted: wanted, ai: targetAI, undo: touched, snapshot: snapshot) }
 
   // MARK: applying
 
diff --git a/Sources/removemacai/App/Pages.swift b/Sources/removemacai/App/Pages.swift
index aadf4d3..eff3c32 100644
--- a/Sources/removemacai/App/Pages.swift
+++ b/Sources/removemacai/App/Pages.swift
@@ -218,7 +218,14 @@ struct TweakGroupView: View {
         Menu {
           Button("Select All") { for t in tweaks where t.supported { model.toggle(t, true) } }
           Button("Select Recommended") {
-            for t in tweaks { model.toggle(t, t.presets.contains(.recommended) || model.state(t) == .applied) }
+            for t in tweaks {
+              let recommended = t.presets.contains(.recommended)
+              if model.state(t) == .partial && !recommended {
+                model.leave(t)
+              } else {
+                model.toggle(t, recommended || model.state(t) == .applied)
+              }
+            }
           }
           Button("Deselect All") { for t in tweaks { model.toggle(t, false) } }
         } label: {
@@ -244,7 +251,7 @@ struct TweakRow: View {
             Image(systemName: "lock.fill").font(.caption2).foregroundStyle(.tertiary)
               .help("Locked by the RemoveMacAI profile")
           }
-          if let note = pendingNote(state: state, wanted: wanted) {
+          if let note = pendingNote(state: state, wanted: wanted, undoes: model.undoes(tweak)) {
             Text(note).font(.caption.weight(.medium)).foregroundStyle(.tint)
           }
         }
@@ -257,7 +264,7 @@ struct TweakRow: View {
         } else if state == .unsupported {
           Text("Needs macOS \(tweak.since.0).\(tweak.since.1) or newer.").font(.caption).foregroundStyle(.secondary)
         } else if state == .partial {
-          Text("Partly applied.").font(.caption).foregroundStyle(.secondary)
+          Text("Partly applied. It stays as it is unless you switch it.").font(.caption).foregroundStyle(.secondary)
         }
       }
       .padding(.vertical, 2)
@@ -266,9 +273,9 @@ struct TweakRow: View {
     .disabled(state == .managed || state == .unsupported)
   }
 
-  func pendingNote(state: TweakState, wanted: Bool) -> String? {
+  func pendingNote(state: TweakState, wanted: Bool, undoes: Bool) -> String? {
     if wanted && state != .applied { return "Applies on review" }
-    if !wanted && state != .notApplied && state != .managed && state != .unsupported { return "Undoes on review" }
+    if undoes { return "Undoes on review" }
     return nil
   }
 }
diff --git a/Sources/removemacai/Engine.swift b/Sources/removemacai/Engine.swift
index 68ffc81..ece6012 100644
--- a/Sources/removemacai/Engine.swift
+++ b/Sources/removemacai/Engine.swift
@@ -66,18 +66,28 @@ struct Plan {
 
   /// From the tweaks that should end up applied and what Apple Intelligence
   /// should look like (nil leaves it alone, a set turns it off except those).
-  static func make(wanted: Set<String>, ai: Set<String>?, snapshot s: Snapshot = Snapshot()) -> Plan {
+  /// A partly applied tweak is often the person's own setting, so it is only
+  /// undone when named in `undo`.
+  static func make(
+    wanted: Set<String>, ai: Set<String>?, undo: Set<String> = [], snapshot s: Snapshot = Snapshot(),
+    state read: ((Tweak) -> TweakState)? = nil
+  ) -> Plan {
+    let stateOf = read ?? s.state
     var plan = Plan()
+    func keepsPartial(_ tweak: Tweak) -> Bool { stateOf(tweak) == .partial && !undo.contains(tweak.id) }
     for tweak in Tweaks.all {
-      let state = s.state(tweak)
+      let state = stateOf(tweak)
       guard state != .managed && state != .unsupported else { continue }
       if wanted.contains(tweak.id) && state != .applied {
         plan.apply.append(tweak)
-      } else if !wanted.contains(tweak.id) && state != .notApplied {
+      } else if !wanted.contains(tweak.id) && state != .notApplied && !keepsPartial(tweak) {
         plan.revert.append(tweak)
       }
     }
-    let profileTweaks = Set(Tweaks.all.filter { $0.inProfile && wanted.contains($0.id) && s.state($0) != .managed && $0.supported }.map(\.id))
+    let profileTweaks = Set(Tweaks.all.filter {
+      $0.inProfile && stateOf($0) != .managed && $0.supported
+        && (wanted.contains($0.id) || (keepsPartial($0) && s.profile.tweaks.contains($0.id)))
+    }.map(\.id))
     let target = Profile.Contents(ai: ai, tweaks: profileTweaks)
     let current = s.profile.contents ?? Profile.Contents(ai: nil, tweaks: [])
     if target != current { plan.profile = target }
diff --git a/Sources/removemacai/SelfTest.swift b/Sources/removemacai/SelfTest.swift
index e260482..ad576c4 100644
--- a/Sources/removemacai/SelfTest.swift
+++ b/Sources/removemacai/SelfTest.swift
@@ -217,6 +217,40 @@ func selfTest() -> Bool {
     program: "/Library/PrivilegedHelperTools/dev.orbstack.OrbStack.privhelper", system: true)
   check(script.owner == "sync.sh" && helper.owner == "OrbStack", "background items are named after what they run")
 
+
+  // Partly applied tweaks are the person's own settings until they ask.
+  var s = Snapshot()
+  s.profile = Profile.Installed(on: true, ai: false, kept: [], tweaks: ["analytics"])
+  let states: [String: TweakState] = ["smart-punctuation": .partial, "autocorrect": .applied, "analytics": .partial]
+  let fake: (Tweak) -> TweakState = { states[$0.id] ?? .notApplied }
+  let applyOne = Plan.make(wanted: ["autocorrect", "file-extensions"], ai: nil, snapshot: s, state: fake)
+  check(applyOne.apply.map(\.id) == ["file-extensions"] && applyOne.revert.isEmpty && applyOne.profile == nil,
+    "applying a tweak leaves partly applied ones and the profile alone")
+  let undoOne = Plan.make(wanted: ["autocorrect"], ai: nil, undo: ["smart-punctuation"], snapshot: s, state: fake)
+  check(undoOne.revert.map(\.id) == ["smart-punctuation"] && undoOne.profile == nil,
+    "a partly applied tweak is undone when named")
+  let undoLocked = Plan.make(wanted: ["autocorrect"], ai: nil, undo: ["analytics"], snapshot: s, state: fake)
+  check(undoLocked.profile?.tweaks == [] && undoLocked.revert.map(\.id) == ["analytics"],
+    "a partly applied profile tweak leaves the profile when named")
+
+  MainActor.assumeIsolated {
+    let model = AppModel()
+    let partialTweak = Tweaks.tweak("smart-punctuation")!
+    model.states = Dictionary(uniqueKeysWithValues: Tweaks.all.map { ($0.id, TweakState.notApplied) })
+    model.states[partialTweak.id] = .partial
+    model.wanted = []
+    model.touched = []
+    model.toggle(partialTweak, false)
+    check(model.pendingTweaks.isEmpty, "switching off a partly applied tweak that is already off changes nothing")
+    model.toggle(partialTweak, true)
+    model.leave(partialTweak)
+    check(model.pendingTweaks.isEmpty, "leaving a partly applied tweak drops an earlier selection")
+    model.toggle(partialTweak, true)
+    model.toggle(partialTweak, false)
+    check(model.pendingTweaks.map(\.tweak.id) == [partialTweak.id] && model.pendingTweaks.first?.apply == false,
+      "switching a partly applied tweak on and off undoes it")
+  }
+
   print(failed == 0 ? Term.green("all checks passed") : Term.red("\(failed) failed"))
   return failed == 0
 }
diff --git a/Sources/removemacai/TweakCommands.swift b/Sources/removemacai/TweakCommands.swift
index 0c11e7d..99d16b7 100644
--- a/Sources/removemacai/TweakCommands.swift
+++ b/Sources/removemacai/TweakCommands.swift
@@ -65,7 +65,7 @@ enum TweakCommands {
       wanted.remove(id)
     }
     let ai: Set<String>? = s.profile.on && s.profile.ai ? s.profile.kept : nil
-    let plan = Plan.make(wanted: wanted, ai: ai, snapshot: s)
+    let plan = Plan.make(wanted: wanted, ai: ai, undo: Set(ids), snapshot: s)
     return run(plan, dryRun: dryRun, yes: yes, verb: "Undo")
   }