From an issue it is possible view all required approvals for each transition and their approval state.

At first the Approval section is hided, by clicking on the right-arrow the approval details are showed.

A progress bar show, in percentage, if the approval requests have been approved (green) or if they are in pending status (yellow).

If one required Approval has been rejected the bar is red and, if the minimun requested approvals (MRA) is set to All, the transition can't be enabled.

Approvals detail

The fields displayed on the Approvals Detail tab are:

It is possible review the approval status of a transition just making reference to the colors of the lines: