Find Stores in Setup
The official README places the option at Setup → Stores → Show Stores in the rail. From there you can sign in to the supported stores and browse their catalogs and libraries.
Downloads go into Games storage. The feature adds each game to the Steam client as a non-Steam game, allowing it to launch through Proton.
Store access is not a compatibility verdict
Connecting a library and downloading a game does not establish that the game runs on your hardware. Apply the same GPU requirements and per-game caution as you would with a Steam title.
Any account, purchase, or licence requirements remain those of the store and the game. This guide does not provide games or store credentials.
Store versus Stores
DroidDeck's singular Store feature installs ARM64 Linux apps and games from Flathub. The plural Stores feature connects GOG, Epic Games, and Amazon Games. Choose the feature that matches the software you want to install.