SUMMARY This might be raised in the wrong KDE component, but change "About System" dialog to be copy-able Linux/KDE Plasma: (available in About System) ADDITIONAL INFORMATION
What about system dialog?
Do you mean KInfoCenter? There's already a button at the bottom of the main page that copys stuff to the clipboard.
Created attachment 124898 [details] kinfocenter screenshot I see no copy button. See screenshot.
Created attachment 124899 [details] kinfocenter screenshot I see no copy button. see screenshot
It is there, but added in a newer Plasma than you are running there.
Thanks. openSUSE's Leap updates are a pain in the butt being too slow going for very stable software. Please close this issue then.
It's already closed (RESOLVED is a closed status; see https://community.kde.org/Get_Involved/Bug_Reporting#Understand_what_the_resolution_statuses_mean)