Teamviewer Mac View Remote Desktop In Full Screen Scaled
If you switch between embedded and full screen mode in Remote Desktop connections, sometimes the connection bar at the top disappears and you may have a hard time to exit full screen or restore the connection bar - especially when the Windows Key redirection is enabled.

It's no secret that TeamViewer, the remote desktop client for Windows, Mac, and Linux, is popular in our neck of the woods. It's free and easy to use, but sometimes remote access will feel. Right click and go to Properties Remote Desktop Settings to change the settings for a specific connection. If you want to change everything then you can edit or create a new settings profile by going to Tools Options General Default Group Settings (and Remote Desktop Settings specifically to change the display size).
To show the connection bar, press CTRL + ALT + HOME
If the connection bar still doesn't appear, you can exit full screen by pressing CTRL + ALT + BREAK
You can find more shortcuts under Remote Desktop connection shortcuts here:

Teamviewer Mac View Remote Desktop In Full Screen Scaled Free
Teamviewer Mac View Remote Desktop In Full Screen Scaled App
Note: the Remote Desktop shortcuts may only work when Windows Key Passthrough is disabled in the Remote Desktop connection properties under Advanced -> Input.