In addition to running a query of open pledges, it would be helpful if we could sort all open pledges within a journal. We see the ellipses in the circle on the left side of the screen. Sorting so these open pledges rise to the top would be helpful for "at a glance" monitoring.
To sort a constituent's journal by open pledges, you can add the Outstanding Balance column and sort it largest to smallest to see option pledges at the top.
You can also filter the journal page down to just pledges if that helps as well.