Remote desktop full screen mode short cut key is Ctrl + Alt + Pause/Break you can also change it from options here are the steps
Start "Remote Desktop Connection".
-Click on "Options".
-Click on the "Display" tab.
-On "Display configuration" settings, change the "Remote Desktop Connection" display with slider from "Small to Large".
-By moving the "Slider" all the way to large, the display settings will automatically set to "Full Screen".
-Click on "Options".
-Click on the "Display" tab.
-On "Display configuration" settings, change the "Remote Desktop Connection" display with slider from "Small to Large".
-By moving the "Slider" all the way to large, the display settings will automatically set to "Full Screen".