Comment 6 for bug 1920578

> Assuming you are using Kubuntu, I don't have access to any Kubuntu install ATM

> Do you know if the issue is present in e.g. 20.04 or 20.10 as well?

I spun up Kubuntu 20.04, 20.10, and 21.04 live CD VMs. I found the theming issue is present neither in 20.04 nor 20.10. On those versions, (aside from the one minor problem of the line underneath the tab) the dialog fits in like a native KDE application. It seems like this is a regression introduced in 21.04.

The about box text is still illegible in all three versions.

Attached is the newly-found expected behaviour, as it was in 20.04 and 20.10.