OneDrive app synchronisation | Microsoft Community Hub (opens in new tab)

I added a folder last night to my OneDrive on my computer. It synchronised to the cloud. If I share the link to this folder, it works perfectly. However, if I open the app, the folder does not show (even after 24 hours). Searching for the folder name (which takes forever btw) yields the right folder.Why is the folder not visible in the place where it should be? And why does the search yield zillions of results instead of just 1?