I can't seem to make the Fullscreen to work, am i missing something or it doesn't really work?

i have this problem as well. it cuts off everything at the bottom of the screen i.e. the chat, skills, and shortcuts. i cant even use the window modes top two resolutions bc of this. i am forced to use the bottom two.

Change the resolution.

If it still doesn't work, it means that your screen resolution is smaller than Onigiri's minimum fullscreen resolution, and it will not work on your device.