@stephjacq – just chiming in on this same issue.
FYI – this is what I see on a stock 3.6.2 install running TwentyNineteen
Screenshot 2019-04-30 at 10.34.12
At first I assumed like @mta1 that this was a bug.
Is the screenshot above the intended/correct UI for this use case?
If so, it’s incredibly confusing.
1.) No label next to the field to indicate its purpose. At the moment it simply looks like a buggy field being displayed for no reason.
2.) The previous UX of simply entering the refund amount was far superior IMHO – what was the motivation for the change?
3.) The tooltip currently states “Refund the line items above” – it’s not clear what ‘above’ is referring to. I would recommend tweaking the tooltip to something like “Enter the refund amount in the input box under the relevant line item above” or something similar.
I think the overall UX implementation for this change probably need a fresh pair of eyes as I’m sure if it’s confusing me (who looks at this daily!) it’s got to be confusing others.
Colm