I am a Mac user. I do see all my photos but I don't see my hard drive and the folders I had for each of my photo sessions. Does anyone have any recommendations or what I need to do to fix this issue?
Please post a screen shot of the full LR windows
First, make sure you are in the Library module. That is the only module that shows folders in the left panel. If you still don't see folders, even though you are indeed in the Library module, then most likely you've hidden the folders by mistake. Right-click in the left panel, in an empty space next to any panel name. That will give you a contextual menu where you can hide/reveal each panel. Also check that you did not simply collapse the folder panel (as with the Navigator in this screenshot). Click on the small black triangle in front of the name.