In the (resolved) issue #3824, the Wikibase selection dialog window has been improved.

@lozanaross and I have tested the "new style" window in v3.7 while observing people during Wikimedia Commons upload user tests, and we notice that its behavior is still confusing to folks, especially the way in which Wikibase instances change place in the window as a new one is selected (the active one will jump to the top). A UX where instances are e.g. in alphabetical order, and the active one is highlighted otherwise, would feel more natural/intuitively understandable.
Proposed solution
This design by @lozanaross is probably still a better way to go (or do we already have a newer version?). Radio button to select the desired active instance, cross to delete an instance, Add another instance button to add a new one. Instances stay in the same place/order and don't switch around after selection/addition.

Additional context
Also see #5007 - may be good to integrate a link to the Wikibase manifest repository as well?
I may miss elements that are relevant for better UX of this dialog, so feel free to chime in with more factors to take into account.
In the (resolved) issue #3824, the Wikibase selection dialog window has been improved.
@lozanaross and I have tested the "new style" window in v3.7 while observing people during Wikimedia Commons upload user tests, and we notice that its behavior is still confusing to folks, especially the way in which Wikibase instances change place in the window as a new one is selected (the active one will jump to the top). A UX where instances are e.g. in alphabetical order, and the active one is highlighted otherwise, would feel more natural/intuitively understandable.
Proposed solution
This design by @lozanaross is probably still a better way to go (or do we already have a newer version?). Radio button to select the desired active instance, cross to delete an instance,

Add another instancebutton to add a new one. Instances stay in the same place/order and don't switch around after selection/addition.Additional context
Also see #5007 - may be good to integrate a link to the Wikibase manifest repository as well?
I may miss elements that are relevant for better UX of this dialog, so feel free to chime in with more factors to take into account.