The tab "Interests" are gone

A couple of weeks ago the tab "Interests" went missing from the left hand side of my facebook page on my PC. I had accumulated a big bunch of pages that I found interesting and sorted them in groups that I found logical. Then all of a sudden they are nowhere to be found. I have clicked most buttons/drop-downs/options but to no avail. I have read about how to administer my tabs which has not helped me one bit.
The odd thing is that if I open FB on a smartphone, I can open a drop-down and scroll down to these tabs and so see them on this media. And no - the solution is not to just use my smartphone! I want to watch it on a proper sized screen.