Hello,
You can change rdp files if you want to specify your monitor.
There is an official link:
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/rdp-files
Take care of 'selectedmonitors' and 'use multimon' parameters.
About how to change your file:
- Open mstsc , and fill in your imformation, then save as.
- Open your saved file with notepad and change parameters in it by following the document.
- Open the rdp file you have configured in step 2.
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