My version does not have an “options” menu item under “tools,” nor can I find anything remotely similar or anything that has an “expert” option.
I probably should have mentioned that I am on MacOS (11.6). The suggested solution regarding highlighted cell color appears to have been for somebody on windows. In any case, my problem has to do with the color of the border of the active cell and has nothing to do with highlighting.
Believe me, I have searched more than I think one should have to in order to find a solution to something so basic as this.
The other solution suggested (changing the font color) I had already seen and it does not help and apparently is a work around that worked for somebody but it does not address the active cell border directly.