Please provide more details.
To delete score files on your computer use the normal file explorer (finder on Mac), navigate to the folder and delete files as any others (select and press DEL).
If you want to delete those in the start center: this is not a real delete but only a remove of a link. There is a command in "File / Open Recent / Clear Recent Files".
If you want to delete files in the cloud - I don't know, I don't use the cloud storage.
Comments
Please provide more details.
To delete score files on your computer use the normal file explorer (finder on Mac), navigate to the folder and delete files as any others (select and press DEL).
If you want to delete those in the start center: this is not a real delete but only a remove of a link. There is a command in "File / Open Recent / Clear Recent Files".
If you want to delete files in the cloud - I don't know, I don't use the cloud storage.