Installing and managing Proton GE on the Steam Deck is straightforward thanks to ProtonUp-Qt , a graphical manager available directly in KDE Discover. 1.Switch to Desktop Mode: Requires restarting into KDE Plasma desktop. Press the STEAM button on your Deck (or press the physical Power button). Select Power from the menu. Choose Switch to Desktop . 2.Install ProtonUp-Qt from Discover: Ensure your Steam Deck is connected to Wi-Fi. Click the blue shopping bag icon in the bottom taskbar to open the Discover Software Center . Click the search bar in the top-left corner and type ProtonUp-Qt . Select ProtonUp-Qt from the search results and click Install . 3.Download the Latest Proton GE Release: Launch ProtonUp-Qt from your Application Menu (under Utilities or Games ) or directly from Discover. Ensure Steam is selected under the Install for dropdown at the top. Click ...