By default, Amphetamine's icon will appear in the Dock and app switcher (seen when using command-tab to switch between apps). This is required by Apple for whatever reason. Amphetamine has been rejected from the App Store by Apple previously because its Dock icon was hidden by default. Thus, if you want to hide Amphetamine's icon in the Dock or app switcher, you will need to take action.
Visit Amphetamine's Preferences → General tab and check/uncheck the box next to Hide Amphetamine's icon in the Dock
Mojave's Recent Applications Feature
In macOS Mojave (10.14), Apple introduced a new section to the Dock called "recent applications." This feature will show a collection of applications opened recently, regardless of whether they present an icon in the Dock. Until Apple provides a way for developers to exclude their applications from appearing in the recent applications section of the Dock, you'll need to turn off this feature if you're seeing Amphetamine's icon there.
To turn off this feature, visit → System Preferences → Dock → Show recent applications in the Dock and uncheck the box next to the preference.
Reset Amphetamine's Dock Preference
In some rare cases, the toggle used in Amphetamine's preferences to control whether to show or hide Amphetamine's icon in the Dock will fail to make the change. To fix this issue, follow these steps:
- Quit Amphetamine
- Launch Terminal.app from /Applications/Utilities
- In a Terminal window, enter this command and press return: defaults delete com.if.Amphetamine 'Hide Dock Icon'
- Relaunch Amphetamine and visit Preferences → General
- Toggle the Hide Amphetamine in the Dock preference
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