On MacBooks with a globe key, fn-f should be ​used for the shortcut View->Enter Full Screen
and View->Exit Full Screen
. Currently, it is cmd-ctrl-f
image showing safari use fn-f:

Image showing orion use cmd-ctrl-f:

Device: MacBook Pro (13-inch, M1, 2020)
OS: macOS Monterey Version 12.0.1
Orion: Version 0.99.108.1-beta (WebKit 613.1.10)
Chrome: 96.0.4664.55 (Official Build) (arm64