I have a phone Xiaomi Mi 9T with Android 9 and I have MIUI installed on it. My problem is that when watching videos on the mobile version of YouTube in fullscreen mode, videos are being cropped. Here is an example: YouTube video on my phone and PC.
On PC
On the phone in mobile version, you can see that the bottom part has been cropped.
I tried on Firefox and Chrome, it seems that every browser on my phone uses the same player, so videos are being cropped everywhere.
Also, if I use the desktop version of YouTube and open videos in fullscreen, then the player is cropped at the bottom.
On phone in fullscreen
Do you know how I can fix these?