Sprite Atlas V2 is automatically enabled by default by the Editor from Unity 2022.2 onwards. If you are upgrading an existing project from an earlier version that used an earlier version of Sprite Atlas, go to Edit > Project Settings > Editor > Sprite Atlas > Mode and select Sprite Atlas V2 - Enabled from the dropdown menu.
When you enable SpriteA 2D graphic objects. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. More info
See in Glossary Atlas V2, the following effects occur:
When you create new Sprite Atlases, they’re automatically set to the selected Mode.
Unity automatically migrates all existing Sprite AtlasA utility that packs several sprite textures tightly together within a single texture known as an atlas. More info
See in Glossary V1 assets to Sprite Atlas V2.
Due to the automatic migration, it’s recommended that you make a backup of your Sprite Atlases V1 before you enable Sprite Atlas V2, as assets converted to V2 are incompatible with V1, and Unity can’t revert them to their original state.