Source: Steam Community (opens in a new tab)
After the 0.9x series versions are gradually updated, we plan to switch the entry of [single player mode] from early key testing to a separate in-library entry directly. After purchasing the game itself, you can directly choose "Single Player Mode" or "Season Mode" in the library to switch freely, allowing you to enter different game modes and experience different worlds.
Attention: Your library may not be able to be refreshed immediately due to the network connection environment with Steam. When you enter the game library and do not find the entry for PVE in single player mode, it is recommended that you log in to Steam again, or reinstall the game and log in to Steam to activate and refresh your Steam library. If you still cannot find the [single player mode] entrance after the above operation, please feel free to contact us at 592974147)