That is what client side decorations <i>are</i>. The application draws in their own windows their own title bars &#x2F; frames &#x2F; min &#x2F; max &#x2F; close buttons and that will happen everywhere.<p>Go open the Steam client on Linux, it is using CSD so it always has min &#x2F; max &#x2F; close in the top right.