Using beta branch of this app

How install Steam Beta

1. Install Flathub Beta

Command:

flatpak remote-add --user flathub-beta https://flathub.org/beta-repo/flathub-beta.flatpakrepo
flatpak update --appstream

2. Install Steam Beta

Command:

flatpak install --user flathub-beta com.valvesoftware.Steam//beta

Note that GL32 and Platform compat extensions are not automatically installed when installing only beta version of the app because they live in Flathub where primary app lives. You can manually install them through following

flatpak install --user flathub org.freedesktop.Platform.Compat.i386//22.08beta
flatpak install --user flathub org.freedesktop.Platform.GL32.default//22.08beta

How run Steam Beta

Command:

flatpak run com.valvesoftware.Steam//beta

I got my Flatpak application into a bad shape and want to start from scratch

To reset Steam Beta for a clean install and settings try:

Command:

flatpak run com.valvesoftware.Steam//beta --reset