User Manual Samsung SM-T575NZKAEEA Galaxy Tab Active3

You'll need a micro USB to female USB cable adapter to make this work. You can buy these at most electrical retailers.
Plug the male end of the mouse's USB cable into the female end of the adapter.
Plug the micro USB cable into your phone's USB port.
You will now be able to use a mouse on your phone. You can follow the same process with a USB keyboard to enter PIN numbers or passwords.

If you're experiencing unusual behaviour on Samsung mobiles, tablets or wearables, you can send us an error report or ask us a question in the Samsung Members app.
This allows us to take a closer look at what is happening. The data is anonymised and only held for the duration of the investigation. Find out more about sending an error report through the Samsung Members app.

Swipe down from the top of the screen twice, to access your quick settings
Swipe left to see more options
Tap NFC to turn it on or off

If the screen on your device is flickering, there are a few steps you can follow to find out whether the issue is software or hardware related. Flickering is usually caused by a software issue which can be caused by glitches in apps or software bugs.

To best protect your device, make sure to update the software so that it is running the latest operating system and has the latest security updates installed.