Hello. From your screenshots, it appears that Pro has crashed. The best thing for you to do is to add your e-mail and a description of your workflow in the crash dialog (the one shown in EditIssue3.jpg) and click "Send Report". These reports are sent to a sorting system here at Esri, and it will be sent to the best team to address the problem. If you include your e-mail, the team may be able to reach out to you to help you find a workaround.
You can also call Esri Support for more immediate help.
