
This option will solve the screen size issue. There is an option named Same as client area which will automatically adjust the screen. You can change the settings of Remote Desktop Connection Manager that will let the screen adjust according to the client’s screen. Method 1: Adjust Screen Size via Remote Desktop Settings Maximize the RDCMan (Remote Desktop Connection Manager) screen before opening up the connection.Sometimes disconnecting and reconnecting solves these issues

#REMOTE DESKTOP CONNECTION MANAGER FIX SCALING DRIVER#
The black bars or black squares can be caused by video driver issues. The size of the screen can be adjusted via the properties or settings of the Remote Desktop Connection Manager. There are a couple of things that can cause this. You will be able to click through the black box or black bar meaning if the black box or a black bar is appearing on top of a start button then you would be able to move your mouse there and click the start button. The black portions of the screen won’t block your interaction with the screen though.

Some people might see bars on the edges of the screen while some people might see black bars/squares randomly spread on the screen. The black bars might vary from user to user. There are cases where users might see black bars on the bottom and on the right side of the remote desktop. There are different variations of the screen problem but the point here is that the screen won’t be normal. This means that the screen might be really big (some of its parts will be out of your screen) or the screen might get really small. On your end, the screen of the remote desktop might not resize properly. However, you might face a few problems on your end while accessing the remote desktop. Remote Desktop Connection Manager provides a great way of accessing remote computers and their files over the internet.
