Replying to my own post here. After further testing here is what I found to work on Xcode 26 with a macOS app project: Create a brand new project name/app. Add desired custom AppIcon.icon from Icon Composer to the Project/Target (pick well you won't be able to change it later) Peform the first compile/build/run of the app ever. Paradoxically, the custom icon will show in Stage Manager but not in the Dock or app switcher (Ctrl+Tab). Select “Include all app icon assets” in the project/target settings and Clean Build Folder/ReBuild/Run/Quit. Unset the “Include all app icon assets” and again Clean/Build/Run. The custom icon should now show in Stage Manager, Dock, and App Switcher. If you replace the AppIcon.icon file in the project it will show in Dock and App Switcher but not in Stage Manager. Further, replacing back the original custom AppIcon.icon in the project will not bring back the custom icon to Stage Manager, only to Dock and App Switcher, with just a generic blank icon in Stag
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Developer Tools & Services
SubTopic:
Xcode
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