Win10, Windows Live Mail, gmail:  I may have accidentally clicked or double clicked (cat at my elbow) near the top of the list of email folders on the left of the WLM screen - but essential folders such as Sent, Spam and Trash have disappeared.  There is a long column of similar folder names, many if not all are my own (I think), but all or most are now empty.  I see the folders I want if I click on "Accounts/Imap Folders" but I can't do anything to affect what I am seeing on the WLM screen.  

I am a NOVICE! but I need to see and work in my own folders.  Where did they go??  How do I get them back???

I have seen similar questions here but none that have answers that are useful to me.  Many answers are dead ends, referring to files or folders or tabs to click on that either don't exist on my screens or are shaded and unclickable.