When selecting “Custom accent color” in “Colors & Themes > Global Theme > Colors” the buttons on the window for picking the color seem out of place, doesn’t seem to follow KDE design.
Overall I think it would be better to launch KColorChooser for this instead of this window, KColorChooser has even more options.
Look here,
1- above systemsettings,
2- The dedicated window for color picking that systemsettings launches,
3- below KColorChooser launched by me manually to compare:
Hi! For what it’s worth, as mentioned in the following KDE Bugtracking System issue - 490861 – Use of Qt's QML color picker dialogs constitutes a usability regression - this is the Qt-provided color picker for situations like this, although it is…not optimal 
It sounds like there’s likely some bigger upstream development effort that would be required to improve this, based on the comment here: 487387 – Use of unstyled Qt QML font selector dialogs constitutes a visual and usability regression
Or we could use our own color picker: kcms/colors: use native accent color picker (!5243) · Merge requests · Plasma / Plasma Workspace · GitLab
Though there may be reasons not to, but that’s what we do e.g. in the color selection for System Monitor and its Plasma widgets.
I have dejavu
Hi,
Issue solved, Notable Bug Fixes, Plasma 6.3.1
If you’re referring to this:
Fixed a few bugs in the Color Picker widget, such as the shortcut option not working, and the tooltip not looking correct in certain circumstances. (Christoph Wolk, link 1 and link 2)
I could be wrong, but I think that’s referring to the dedicated Color Picker widget that can be added to a panel or desktop, rather than the popup dialog that appears when you’re picking a custom accent color in System Settings.
