This question already has an answer here:
For some reason, my file window when I am opening a file/folder or uploading something the sidebar is missing a lot of items which makes navigating to my destination a pain. What am I missing? My normal finder window is fine and isn't missing any items. I tried to go into the library>preferences>and deleting any com.apple.finder.plist like in another thread but I didn't find any files like that in my library. I searched my entire mac for them and didn't find any.
I'm using El Capitan.