In the previous UI of Power BI Service, developers can move between different reports using the left navigation bar. With the new UI, this is no longer possible. This is particularly challenging when testing a role that has object-level security over a thin report. Inadvertently using a field that is blocked by the OLS will result to visual errors (this is true even for inactive elements of the visual such as a dynamic title that has been turned off), but the author may not be able to catch the visuall error without testing the role. Testing a role in Power BI Desktop for thin reports is also currently not possible so the Power BI Service is the only option.
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