You import those images into LR. LR is not a File Manager like Bridge. You first have to import images into LR for them to show up.
Bridge displays all the drives on your system, just like Windows/File Explorer in Windows or Finder on a Mac. The only drives and folder that show up in the LR Library module are ones that you have imported images from.
IIRC you can drag images from the Bridge window onto the LR icon or into the LR window and that should open the import dialog window in LR.