Firstly, if you don't know how to install Discovery apps on Steam Deck, you can just click here
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"How to install apps on Steam Deck using Discover store"After the installation of CoreKeyboard from the Discover Store, you can create a shortcut for it inside Steam desktop settings.
This way, you can just open it like a built-in keyboard.
1) First, open the Steam settings in desktop mode
2) Click the controller button
3) Click on the Desktop Layout Edit button
4) Change the L4 and R4 buttons to Ctrl and F4
5) Now open the system settings and click on the Shortcuts button
6) Click on the Add application button at the bottom
7) Type CoreKeyboard, select, and hit okay
8) Select CoreKeyboard and add Ctrl + F4 for shortcuts.
Now, when you click on the L4 and R4 buttons, CoreKeyboard will show up and disappear.
Enjoy your new keyboard.
