After I move all the files in the folder to another place, the mouse stops on the folder and puts it, and the pop-up prompt shows that there is still content inside, and it will not be automatically refreshed.
Tooltips showing folder contents are cached and don't track changes made to the folders, for performance reasons. Push F5 if you need them to be refreshed.
Can the software set the cache to be automatically refreshed where changes are made?
It's not done for performance reasons.