Vinagre

Vinagre - remote desktop viewer, control

configuration

There doesn't seem to be any.

help

stuck in full screen

position the mouse cursor in the top center of the screen. Now the "local" mouse cursor should become visible. Once visible, you have keyboard shortcut control of the local desktop not the remote desktop. Now you can alt-tab. If the cursor is not visible in the top center of the screen all control reverts back to the remote desktop.