I'm confused. You control the "W"idth, the "G"rid spacing, and the "U"nits, everything you highlighted in red. The red boxes you show are all dynamic while working in Layout or Router. Are you having inconsistencies (#.00, #.000) in your reports or output files?
From the PADS Layout Help the resolution in PADS is:
- 1 mil=38100 basic units (0.000026 mils)
- 1 millimeter = 1500000 basic units (0.000000667 mm)
It appears that PADS truncates this to two digits for mils and 5 digits for mm. You can't use additional digits in mils (10.273 mils gets rounded to 10.27 mils), I don't know of an option to change that. Trailing zeroes are not displayed.