How Do I Sign Out Of The Mac App Store?
Logging out of the Mac App Store is fairly straightforward. First, launch the App Store on your Mac. It's located inside the Applications folder but can also be accessed via the Apple menu at the top left corner of your screen.
Once in the App Store, look for the Store menu next Edit in the Mac menu bar. Click on Store then select Sign Out. As a warning, once logged out of the App Store any apps purchased via your App Store account may no longer function.