Mail preferences panel blank
In High Sierra tried to open mail preferences but the panel is blank.
I see a previous solution was to click a 'pill shaped button in the top right of the panel' but this does not exist in my panel. I have tried clicking around incase it is completely invisible but no joy.
Any suggestions?
Roloat
iMac11,3, Mac OS X (10.6.5), Mem 6Gb