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To turn off Desktop Effects (Desktop Compositing) in Manjaro KDE this can be done by making the following changes:

1. System Settings > Display and Monitor > Compositor
2. Uncheck “Enable compositor on startup”
3. System Settings > Shortcuts > Shortcuts > KWin (Under System Settings)
4. Click on “Suspend Compositing:” and uncheck the box next to “Alt+Shift+F12”
5. Click Apply
6. Reboot