How to Change Game Version for Minecraft: Java Edition
Minecraft will automatically set itself to the current version for ease of use, but sometimes you need to revert, especially if your favorite map was created with an earlier version. Luckily, it’s easy to change your Minecraft version with a simple launcher configuration. Let’s walk through that, now.
WARNING You absolutely should back up your worlds before changing the game version. If you access one of your current worlds with an older version of the game, you can permanently damage that world! Make sure to keep a copy of your game files safe and separate when rolling back versions.