I actualy do a lot of testing in FLStudio (i’m a proud owner for more then 7 years i think).
Anyway the fact that the menu gets greyed out is because the window doesn’t catch focus, you can try to click on the resizer corner (lower right corner) and see if that activates the menu. This is something that’s implemented in the library i’m using and is hard to code around but i think i might have to.