Sudden change of active window (strange behaviour on iMac)
While working in one application (e.g. Word, Excel, Mail) every now and then the computer seems to activate something else outside of the active window.
E.g when working in Excel, scrolling down or typing in a cell, suddenly nothing happens and I have to actively go back to the screen to continue my actions.
Sometimes I believe it has to do with my mouse triggering unexpected actions, or rather that someone is connected to my Mac as well and purposely uses a shortcut or mouse action to annoy me. Similar to a TV where someone with a secondary remote is switching channels while you are watching your favorite movie ;-)
I have changed difference mouse settings several times, but above behaviour continues.
iMac 21.5", macOS 10.15