This issue happens to me sometimes and honestly I don't recall all the situations where it happens, but I do know one situation:
I will put under test and get a message that there are integrity problems. When I click OK and select an integrity problem relating to a process, I can see the top half with the Name/Rule, but the bottom half with the Standard/Textual View is missing. No amount of clicking on the Name/Rule will bring it up. If I switch to a BO rule, I can see the views for that rule, but not if I switch back to the process.
The only workaround I know is to close down and restart.
Can't access views for a process
Can't access views for a process
v8.1 on Windows 10 / MySQL 5.6 (local), v8.1 on Windows Server 2016 / MySQL 5.6 (server)