It would be really handy if your 3D grid preferences were saved either with the file or in the Clo preferences. I find that when I format the 3D background to the default flat colour of dark grey, the tones of the grid lines no longer look correct, so I change their brightness values in the grid properties, but I find I have to do this every time I re-open Clo – even on files that I've worked on previously. So I think it would be good if your Grid Properties were saved somewhere so that you don't have to keep re-inputting your preferences every time you close and re-open Clo.