Hi Domenico,
Thank you for sharing. Sounds like you're having trouble with OneDrive – the scroll bar is gone in Photos, Explore, Places, See All and it's stopping you from seeing all your photos. I Understand how frustrating this would be, especially since you have a ton of geotagged pics and the old view was easier to use.
Based on my knowledge, it looks like OneDrive's web thingy isn't so good with lots of location-tagged photos. The scroll bar just vanishes when there are too many places listed, and zooming out doesn't really fix it. It looks like a bug.
Try using keyboard arrow keys to navigate or by accessing the Photos tab directly instead of the Explore view
May I ask can you scroll through photos okay in other parts of OneDrive, like in Albums or the main Photos area? And are you mainly using OneDrive in your web browser or the app on your computer?
Let me know if you have more info or questions. I'm happy to look at other things you can do to organize and view your photos better.
Best Regards,
Noel