MlsDmitry

1. Ctrl + F keys and a lot of other key combinations are hooked by MacOs. You're mostly don't use them, so just turn everything off in System Preferences -> Keyboard -> Shortcuts. If you have another software that handles your key combinations, like Keyboard Maestro, you should turn these actions/macros off, otherwise you won't get right hex sequence.

2. Enter command below in default MacOs Terminal. (Warning!: shortcuts can also be hooked by terminal emulators, like iTerm. To avoid it use default MacOs terminal. If you are on alacritty, you can enter alacritty --print-events and use poped up terminal).

xxd -psg

then type your key combination and hit enter. (Warning!: if you don't see any output for your combination, then read step 1 again)