A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I’ve been having this issue as well and it’s been driving me insane. I use my ipad with a keyboard and have just come across a fix. If you hold down shift and select a cell then the next time you select a cell it should revert back to normal. It appears Excel keeps getting stuck in its extended selection mode. If you use a keyboard it makes the bug vastly more manageable until Microsoft fix it!