Created attachment 144564 [details]
Discover settings display

Discover's settings display of which software repository group is the default is difficult to parse easily. This is because the display is almost identical for both the default sources and for the non-default sources.
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It is difficult to determine which repository section is marked default vs. which is not the default. At present, both the current default registry group and the non-default registry groups have nearly identical visual references: i.e. a star followed by the words "Make Default". The only visual reference I note is the star being black for a section that is not currently default, and a gray star for the section that is the default. There's no indication that those items are, in fact, also buttons which will change the setting. Additionally, depending on one's display settings, the difference between black and gray is easily confused, and the fact that the default section still says "Make Default" is further confusing.

Only moving the mouse around various areas provides a hint as to function. If one happens to notice it, a blue box then appears around the "[star] Make Default" for the section that is not currently the default. The intent appears to be to show that what appears to be a label, is also a button which can be clicked in order to make that section the new default.

The display would perhaps be more easily parsed by providing a more readily seen visual reference showing which section is the current default. One way would be to vary the color, rather than the shade of the currently used color. Older folks (like me) and those with less visual acuity often have problems with shades of gray. Another method would be to change both color AND wording, so the selected default section changes color and ALSO clearly states "Default" (or perhaps "Current Setting" or similar).
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STEPS TO REPRODUCE
1. Open Discover
2. Click Settings
3. Examine displayed list of repositories

OBSERVED RESULT

Little distinction between similar items which at first appear to be labels, rather than buttons

EXPECTED RESULT
Clear distinction indicating both the current setting, and that these are, in fact, buttons that can be used to change the setting.

SOFTWARE/OS VERSIONS
Windows: N/A
macOS: N/A
Linux/KDE Plasma: Fedora 34/Plasma 5.22.5
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

Kernel - 5.15.6-100.fc34.x86_64
Graphics Processor - Radeon RX550