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Works for me ... View > Fullscreen.

it's almost 2023 - this has been an issue for almost what, 6 years now? Has there been a fix? The best I can do is maximize a windowed view which has an annoying title bar at the top. I still can't go fullscreen....
Works for me ... View > Fullscreen.

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I mean the Rekordbox Video plugin, specifically. I want to be able to do fullscreen video on a remote monitor without it jacking up my laptop video and effectively breaking until I shut down and restart Rekordbox. I'm able to double-click the window title to maximize the window, but I'd love to get rid of the title bar at the top of the window by going fullscreen on it.
That has more to do with how macOS handles the app windows. Unfortunately with video you're limited to having either video fullscreen or the app fullscreen, but not both. Sorry!