Hi!
Try doing a search for “stuck on blue bar”
Search results for ‘stuck on blue bar category:200’ - Microsoft Flight Simulator Forums
See if this will help you:
https://forums.flightsimulator.com/t/stuck-at-blue-bar-loading-page-while-trun-on-the-online-data/384148
Another thing to check is that all content in the Content Manager is downloaded.