Some questions about the name of widget and other things

[heddxh]

For some reasons, this vertical tab(list?) looks weird(no transparent and blur, focus tab no corner radius) using theme Utterly Nord Light, so I want to change it myself. But I found I don't know the name of this widget. (The application in my screenshots is Gwenview)

Secondly, there is a transparent part "behind" my blur part in all QT applications.

I guess it is window decoration's fault so I modify the themerc(for me it is Utterly-roundrc), decrease the PaddingBottom``PaddingTop``PaddingLeft``PaddingRight. It does work----the transparent part is mostly covered by the blur part. But I want to know is how can I avoid the transparent part exactly? Or how can i fill the blur part wholy in the window? May the latter is more elegent and can do with Kvantum.

Thanks for your incredible work! I spent days reading the issues and posts here and your patience is memorable.
And sorry for my poor English(

[tsujan]

But I found I don't know the name of this widget.

It depends on the app and its code. Most probably, it's controlled by GenericFrame and ItemView sections of the kvconfig file of the theme (and, of course, its corresponding SVG file).

there is a transparent part "behind" my blur part in all QT applications.

It should be the window decoration you use. It can't be controlled by Kvantum. Sorry, I can't help you in that regard; you might want to ask its author.

I've made BreezeEnhanced, as a fork of KDE's Breeze decoration, especially for use with Kvantum.

[heddxh]

Wow your decoration is so great without and bug and blend with my theme, thank you!
And I should read the document more carefully to fix other bugs in the Nord theme I an using :)
Besides, I wish you Merry Christmas in advance!

[tsujan]

Happy to know you've found it useful.

Merry Christmas!