PUBG Mobile players can check the camera view settings that control the character's field of view as shown below.

1. Select ▲ on the bottom right.
2. Select the settings.
3. Go to 'FPP/TPP (First person point of view/Third person point of view) camera view setting' at the bottom of the main tab.

Also, the lower the camera view settings are, the character's field of view will be narrower and the higher they are, the wider it gets.

However, if the screen of the device is larger than a certain size, even if you enable the settings, please take note that they may not be applied.