Unwanted zoom function on Mac

When I’m making a Libre spreadsheet, I’m often command-tabbing around to other programs. The problem is that there’s some kind of shortcut (that I’ve never noticed happen in any other program) where if I’m holding the command key and also moving my finger on the track-pad it zooms in on the spreadsheet.

It happens a lot and I will never want to use this function on purpose. Its so sensitive that actually I don’t even need to be touching the track-pad but just hovering over it will often still cause this to happen while I hit the command key.

There’s a lot of entries in the help about adding short cut type things but nothing about stopping them. Any help would be greatly appreciated!