To adjust the screen brightness, please follow these steps

  1. Swipe down from the top of the screen.
  2. Adjust the brightness slider (see image below) - Left is dimmer and right is brighter.

  3. If you've moved the slider fully to the right and the screen is still too dim, make sure the checkbox marked "auto" is not ticked, then try again.

Note: having a high screen brightness will significantly impact your tablet's battery life, and vice versa, having a low screen brightness is a great way to save battery.