There are 2 ways I"m aware of that you can stop sharing certain files if that is what you really want to do!!!

1st in the LW library higlight the file and single right click then click stop sharing. "Warning Do Not Click Delete" if you do the files are gone period. You will have to get a file recovery program to get them back.

2nd in LW tools>options>sharing ---- shared folders ---- you can highlight the folder then click the remove button --- then click apply then okay. This will remove that folder from being shared.