Hi Hermanth,
The directory you mention, is for the version control . See https://docs.mendix.com/refguide/version-control/
The directory is hidden and in the Windows File explorer it can be made visible.
Go to your Documents\Mendix directory select Documents\Mendix\LearnNow Training Management-main_2 and press <Alt> + <Enter>. And view if there are restrictions in the folder rights. My rights are:
If your project is OK on the Team Server, you could choose to delete the Documents\Mendix\LearnNow Training Management-main_2 directory and choose Öpen in Studio Pro. Also, consider deleting the other folders Documents\Mendix\LearnNow Training Management-main_1 and Documents\Mendix\LearnNow Training Management-main if they are not there for a reason.
I think the above will work. Let us know in a comment.