CustomMaskSize
Defines the size in pixels or scaled pixels of the custom save mask. The parameter contains two positive integer numbers separated by whitespace or punctuation.
If CustomMaskDpiAware=false, CustomMaskSize is defined in pixels; if CustomMaskDpiAware=true, CustomMaskSize is defined in pixels of a 100% scaled screen.
Possible values: two positive integers
Default value: 685,418