Setting up Remote Desktop in a multiple-monitor scenario isn't complicated--but you have to know which editions support the feature.

To save Remote Desktop Connection Settings to RDP File, and open it, on Windows 11/10 computer, follow the instructions in this post.

On the RD Web Access server, click Start, Administrative Tools, Remote Desktop Services, Remote Desktop Web Access Configuration.

'Cred Picker options' allows you to configure settings for passing KeePass account information to Remote Desktop Connection. In 'Mstsc options', you can set the remote desktop connection.