Shortcuts

Keys	Action
F1	Open the help. While a game runs: switch the focus between the game and this app (works from the game too; the key can be changed under View > Focus switch hotkey...). Windows only.
Ctrl+O	Add game...
Ctrl+S	Toggle the game between monitor 1 and monitor 2
Ctrl+F	Fit window to monitor...
Ctrl+L	View logs...
Ctrl+M	Move this app's window to the other monitor
Ctrl+B	Switch to the floating bar
Ctrl+Alt+D	Stop the downscaled view (works even when this app is not focused). Windows only.
Ctrl+Alt+I	Show or hide the game info overlay (works from anywhere, also while the game has the keyboard). Windows only.
Ctrl+Alt+M	Release the mouse from a game that holds it, and bring this app to the front (works from anywhere). Windows only.
F2, twice within 2 s	While a game runs: terminate it, like Shutdown (works from the game too; View > Terminate hotkey...). Windows only.
Ctrl+Q	Exit

The keys that work from anywhere are global hotkeys. F1 and F2 are registered only while a game runs, so F1 opens the help otherwise. See Focus, mouse and hotkeys.