So I have a Samsung phone and I play minecraft bedrock edition. Whenever I try to open another tab it disconnects my friends from my world. This also happens when I try and change my skin. Does anyone know if I can change it and why this happens?
Minecraft skin bug
minecraft-bedrock-edition
Related Solutions
If you started a server the default player limit is 20 players. You can change this, but if you are only playing with a group of friends, 20 should be plenty.
This site explains how to download a server: http://www.howtogeek.com/202961/how-to-run-a-local-minecraft-pe-server-for-fun-and-persistent-world-building/
This site holds the download: http://www.pocketmine.net/
LAN does have its limitations and going around them is easiest.
You need to press the "coat hanger" icon on main menu. Here is image about the button: 
Best Answer
If you stay inactive from your LAN world, everyone gets disconnected. This goes for any tab outside of Minecraft.
What you can do is to use split-screen, but it doesn't look good, so get to a tab, and when you think it's nearly time that your friends get disconnected, go back.