Hi @Anonymous ,
The delegation is warning, meaning over 500 rows in the list and it won't pull everything back.
You could try this instead:
UpdateContext({AllRows:'Support issues'});
UpdateContext({CompletedCount:CountRows(Filter(AllRows, Closed= true))});
UpdateContext({TotalCount:CountRows(AllRows)});
Then for the progress bar, add rectangle with a fixed width (the outline of your bar) and add another one to act as the percentage fill. Set the second bars width to:
(CompletedCount/TotalCount)* NameOfYourOutlineRectangle.Width
Should give you something like:

Note that the variables are defined OnVisible, so you need to flick between screens for them to get set.
Thanks,
Liam.