Steam: "Could not save properties due to insufficient write access"

I've gone ahead and installed Steam (flathub) from the Discover Store on KDE Neon, and I have a Steam Icon on my desktop. What I want to do is set it to run with my dedicated GPU. So I right-clicked and chose Properties: Then I went to the "Application" Tab and chose "Advanced Options". There I enabled "run using dedicated graphics card": But when I save this, then I get an error popup that looks like this: > Could not save properties due to insufficient write access to: /home/shaunroselt/Desktop/com.valvesoftware.Steam.desktop. But how and why? This is my PC. Why would I not have the sufficient write access? --- There is also nothing useful under the "Permissions" tab as those permissions aren't editable: --- How can I get the necessary write access so that I can change properties on Steam?