If you're developing with electron on macOS and clicking the fullscreen button (or 'Enter Full Screen') makes a BUMP noise, check if you're launching it through tmux or screen. For... reasons... this doesn't work out of the box. A quick fix is to launch the dev process directly from your shell - I use a separate tab for this since I'm a tmux addict, but you can also use the splits feature of iTerm2 to manage it.