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Some installations are experiencing issues with accessibility functions. You can fix that by following this procedure:
Magnet can handle all standard resizable windows in OS X for you. Magnet can not do anything with non-standard windows used by some developers. Fortunately, such windows are quite rare. Adobe Creative Suite & Creative Cloud apps older than 2017 version is not supported exactly for this reason.
Certain apps require a minimal width of their window. In some cases the width can exceed half of your screen, particularly on small screens like Macbooks'.
Magnet is compatible with macOS 13 Ventura or later. If you can run such macOS, Magnet will be working fine on your Mac.
You can arrange your windows in any active Spaces screen. You can not do it across different Spaces.
The Mac App Store probably just got confused by all the certificate, signature and security stuff. Simply trash your Magnet from the Applications folder and redownload from the Mac App Store. There’s no charge and you will keep your current settings.