Gamepad isn't work in rivals, rush and use doesn't full screen

I purchased the FC26 Ultimate version through Epic Games. It hasn't been full-screen since I bought it (I tried changing it from the settings, but it doesn't work). The second problem is that when I log into Ultimate Team from the main menu, it sees the PS4 controller until the Rivals and Rush matches start (on PC). But once the match starts, I can't use it or it doesn't see it. Also, matches are very slow in all modes; even on the lowest settings, it lags a lot on PC. I was quite happy with the 10-hour trial version. Please help, thank you. I wish you good work.