Important to note that you need to install a library from inside the app's settings to enable swipe typing. Ctrl+F "enable gesture typing" on the Github page to see where to get it.
I loaded the library but couldn't see a toggle to turn it on.
No, it's the fork I've linked. You got it from here, yes? Also, the option only appears after you successfully load a library by going to Advanced > Load gesture typing library. Since you said you'd already loaded it I didn't mention that. You might've loaded the incorrect file or something.
I loaded the library but couldn't see a toggle to turn it on.
Uhhh it's pretty blatant.
OpenBoard Settings > Gesture Typing > Enable Gesture Typing
Is this a different fork
No, it's the fork I've linked. You got it from here, yes? Also, the option only appears after you successfully load a library by going to Advanced > Load gesture typing library. Since you said you'd already loaded it I didn't mention that. You might've loaded the incorrect file or something.