A true portable version should save your worlds and settings inside its own folder (usually a subfolder named data or .minecraft ).
: The only 100% safe way to play Minecraft is through the Official Minecraft Launcher . Minecraft_1.19.3_Portable.rar
: Ensure you have run the "Vanilla" (unmodded) version at least once. If you are using mods like Forge or Fabric, they require specific installers. A true portable version should save your worlds