Quick Play is a shortcut bar, not a new Minecraft.
After you leave a world, Realm, or server, a tile appears on the Java or Bedrock Play tab. One click skips the title screen and the world list. It is on by default.
Requirements that actually matter
- Java Edition 1.20 or later for Java tiles.
- Bedrock Edition 1.20.60 or later for Bedrock tiles.
- You must have launched that world after those versions. Older saves do not backfill.
- Tiles are stored locally with the launcher. They are not a cloud recents list.
Turn it off
Settings → Quick Play → uncheck. You can also clear saved entries there if a deleted world still shows a ghost tile.
Mojang’s announcement: Quick Play is coming to Java and Bedrock Edition.