Calc Red box round cells

In my data storage system on calc I have a red box round each cell which has data in it. Why is thia and how do I remove it?

Track changes is shown with a red line with a litle square at the top left corner, and invalid data with a red ellipse.

image description

Tested with LibreOffice 6.4.7.2 (x86); OS: Windows 6.1.

Hello,

you probably activated Track Changes mode by inadvertently pressing CTRL+SHIFT+C key combination. Press once more or untick option Edit -> Track Changes -> [ ] Record to deactivate.

Hope that helps.

I think it is Menu/Tools/Detective - Mark invalid data

ctrl shift c worked THANKS.