HI! I have the Mac and use Lightroom 5. I've done this before but I completely forgot what I did to retrieve my older folders. After I created a "Smart Collections" my older folders/catalogs all vanished off the left panel. The only photos and catalog that show up is the new "Smart Collections." I tried doing the "Open Catalog" and "Open Recent" options but it only takes me to the current photos with no options of the older photos that were on my lightroom 5. I remember it was only a few clicks to relaunch and all my older folders/catalog on lightroom reappeared. If anyone knows what to do please help. I'm on a deadline and need to retrieve the other folders. Thanks!
I use a PC and to change catalog you hold down the Shift key as LR starts. This gives the options to open a different catalog. Hope this helps.