Sprite Packer mode for the current project.
| Disabled | Doesn't pack sprites. |
| BuildTimeOnly | Updates the sprite atlas cache when the Player or bundles builds containing Sprite with the legacy packing tag. |
| AlwaysOn | Always maintain an up-to-date sprite atlas cache for Sprite with packing tag (legacy). |
| BuildTimeOnlyAtlas | Pack all the SpriteAtlas when building player/bundles. |
| AlwaysOnAtlas | Always pack all the SpriteAtlas. |