To reallocate RAM to "Minecraft," you'll have to edit the game's settings through whatever launcher app you use.

If an installed app or game is demanding more resources, and you want to ensure it is performing as well as it can, you can manually assign that item more RAM. I’ll show you the various ways—including ...

You can play Minecraft solo, but it's much more fun with friends. Here's how to play multiplayer in Minecraft: Java Edition.