You can enable or disable Shadows and even anti-aliasing. With PUB Gfx Tool you can Unlock the most fps that can come out of your device. You can also unlock the HDR resolution on low-end devices. With this App, it supports 1920 x 1080p of Crisp Resolution. With this App, you can change the resolution of the game.

But none of them have even come close to what this App can do. There have been many Apps that have stormed the Play store with graphical settings for PUBG.