Created attachment 843781 [details]
dialog buttons hidden
DPI = approx 118, based 15.5" diagonal , resolution 1600 x 900 screen
System font size = 20 in mousepad monospace regular
xrandr | grep'*' is (from XFCE terminal)
et@Janet:~> xrandr | grep '*'
1600x900 59.99*+ 59.99 59.94 40.00 59.95 59.82
et@Janet:~>