I noticed a few weeks ago so of the buttons on the left hand side have changed or lost functionality such as when in a workspace, you usedt to be able to click on the name of the workspace on the lef...
This issue also prevents testing the RLS of multiple reports that share the same dataset (i.e. thin reports).
Previously, you could go to the dataset's options and go to Security --> "Test as Role" to view the report as a specific user. You could then expand the workspace reports on the left pane to enter another report. If that report shared the same dataset, then you would also view that report as the specified user.
This functionality was key to our ability to review row level security. Please prioritize a fix for this!