Hi Micron,I think what you are referring to is the colour of the selected cell indicator.
That is not the cell border you're looking at. From my research, not possible to alter the colour of this application feature. Best you can probably do is change the background colour of the selected cell. If that's of interest let me know. If so, I presume you'd want the cell colour to go back to what it was before?
I would be interested in this solution, with the cell return to normal.
I will post my own question for this. But thought I’d grab your attention f you don’t mind. Thank you
Dan