>when I click to activate the popup with a legend, I am not able to close that popup anymore. Something I do wrong?

Wow, you actually found something I hadn't tried. There are 5 pages in the report, and in Power BI they show as horizontal tabs at the bottom.

However, when I publish to the web, Microsoft (for reasons I'm not sure about) strips the horizontal tabs and shows that little "1 of 5" thing. I had never clicked into there. If you click in the same spot you clicked in initially, it will collapse.

That's why I put the five pages as buttons in light purple near the upper left...crude page navigation for now.

thanks for noticing