Only a few cells "normal", the rest "greyed out"

Hi Forum,

I sometimes come across spreadsheets that have only a few white, "normal" looking cells and the rest are grey with no borders.

Usually there is a thick blue line around the "normal" cells and I can make more cells look "normal" by dragging the blue border line.


What is this? And, how do I set it up in a spreadsheet if I need to?

Thanks very much

Dave

Hi Jakob,


Yes, that's it! Thanks very much.


Dave