Hi @NicolasGombault,
I can see how that is annoying. Thanks very much for your feedback. We will be enhancing the Sign in/out experience. For now, could you please try something below?
- Add a new report page
- Add ArcGIS for Power BI visual in that new page
- Log in with your credentials
- Tab back to your original report page
Then the credentials should be carried over to your original report so that you don't need to delete anything from your original report. Please feel free to remove the newly added page if you don't feel there's a need after sign in or change as a standard user on that new page.
Hope this helps. Please let me know if you have more questions.