Hello,
You could change your settings in your default rdp file:
Open mstsc -> click show options to expand more settings -> choose save / save us to save your rdp file.
Change your default settings by changing the file.
You can find these options:
dynamic resolution
Syntax: dynamic resolution:i:<value>
Description: Determines whether the resolution of a remote session is automatically updated when the local window is resized.
Supported values:
0: Session resolution remains static during the session.
1: Session resolution updates as the local window resizes.
Use this link as a official reference:
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/rdp-files
If the Answer is helpful, please click "Accept Answer" and upvote it.