How to exit fullscreen mode in vinagre VNC client?
I have not found any key combination to do this.
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You also have to enable keyboard shortcuts in the Menu (check view->keyboard shortcuts). Then F11 is you key of choice (for me at least in version 3.22.0, you can check the shortcut key once it's enabled in View->Fullscreen)
This is where I found the suggestion: https://bugs.launchpad.net/ubuntu/+source/vinagre/+bug/1547770
For me the following worked in Ubuntu 16.04: move mouse pointer to the top center of the screen. A hidden toolbar should've appeared, but it doesn't. It turns out, it is still there, it's just invisible: mouse pointer shape changes in that region, when it touches the top edge of the screen. So I click where I expect the "leave full screen" button be, in the left part of the invisible toolbar, and it leaves fullscreen mode. Position of the invisible toolbar can be probed by watching mouse pointer shape changes.
From the official website
While in fullscreen mode, move the mouse to the top-center of the screen to display a hidden toolbar, which has Leave Fullscreen, Disconnect and other buttons.
There should be a menu showing up when you bring the mouse at middle the top of the screen.
You can also use the Super + Esc key combination to send the next keystroke to the host (this is mentioned in the popup when you start a fullscreen session), so you can then use Alt + Tab or Super again to switch to another app or terminate the session.
Super is the Win key (logo) on Microsoft™ keyboards.
Note: For me the top menu didn't seem to work at all; I noticed later that the tooltips would show up as I hovered around where the menu buttons should be, so the menu is there but not visible and the tooltips might be sufficient to find the right button. None of the other answers I've seen mentioned the appropriate default key combination for my standard Remote Desktop app on Debian Buster.