A problem with my importing of files

Probably my own fault, but now trying to cure it ==yesterday I meant to import some pics in a folder into LRC into a new folder - I thought I selelcxted a folder with about 200 pictures in it == but apparently what happened was iI ended up wiht current import of 21,000 - but the bar across the top is stalled at 2/3rds.  I did a move nad import photos but on looking at my suspected source [a separate harddrive] there are no empty folders that i can see - so now I would like to figure out where they did come from and what to do about the stalled line at the top - I see no way to check activity progress only the # of pics being imported.  [the folder contents are 50G as of now]

And is there a way to get thos pics out of the LRC Library [put back?] or do I just live with them unless I want to export to a new location?  I'm new enough at LRC undoing my mess would probably be fine.