In the Below steps, we will describe How to set up multiple screens/monitors when connected to a server via Remote Desktop
1 Open Remote Desktop client.
2 Click Show Options from bottom left corner of the window.
3 Click Display tab from the top menu.
4 Click checkbox Use all my monitors for the remote session.
5 Optional select Color Depth Profile. This improves performance over slower connections!
6 Click General tab from the top menu, then click Save to save your Settings.