Problem:
When wanting to override arrowhead-types of a dimension on a drawing, it's not very clear which arrowhead is number 1 and which is number 2. This is the first problem I'm having but an Idea that addressed this issue has already been submitted on this page: https://forums.autodesk.com/t5/inventor-ideas/add-arrowhead-numbers-when-editing-placing-a-dimension.... Unfortunately there are only three votes yet.
When wanting to edit the other arrowhead, you must leave that little dialog window select 'Edit 2nd Arrowhead' and change the arrow-type. That's lots of mouseclicks.
Solution:
Combine the edit arrow-head dialogs into one dialog in which you can change both arrow-heads. Suggested workflow: Right-click the dimension, select 'Edit Arrowheads' and change according to your needs. Such dialog could look something like this:
Edit both arrowheads in one go...
Another solution could be to edit all relevant properties of a dimension in a Properties browser, like the one in AutoCAD (ctrl-1).