Resolution Width / Height Offset

Hi, have done a bit of searching on this and it appears some versions of RDM allow for a Width/Height offset.
I am unable to find this setting in 2026.1.19.0. Has it been deprecated?
Looking for the possibility of creating a "margin/border" within the work area for RDP sessions. Illustrated in photo below.
The custom resolution works fine for this on the main productivity "office" machine. When using RDM on laptops in the field, it gets a bit tricky. Ideally a -20 or 40px width/height offset would be fantastic.
Thank you!