Elisaveta, I know what you mean if you're just referring the messaage you get when trimming. Unfortunately,
Playsound's fix doesn't apply here and I don't think there's any way to disable it.
The message has been poorly worded for years, always mentioning "applied reverse" when it can be many different effects, like video speed or rotation. The only workaround I've used is to either hit <spacebar> or <Enter> to dismiss the warning every time, or to hold off on applying those effects until I've got the length finally set.
That's probably a really good suggestion to add to the "Cyberlink, listen to this suggestion" thread!
YouTube/optodata
DS365 | Win11 Pro | Ryzen 9 3950X | RTX 4070 Ti | 32GB RAM | 10TB SSDs | 5K+4K HDR monitors
Canon Vixia GX10 (4K 60p) | HF G30 (HD 60p) | Yi Action+ 4K | 360Fly 4K 360°