If there are others having this issue, this is what I did (I'm using a really old version of Firefox 48.0.2 with an iMac):
1.? Go to Members section on left panel.
2.? On the blue button on top, toggle to choose Members.
3.? Click Download.? A new screen appears with a list of the members in a not-so-friendly format.
4.? Right click on that page and choose Save Page As... and click save.
5.? This saves as a .CSV file and you can open it directly and it'll open via Excel and the columns are already separated out.
6.? You can save it as .xlsx after opening.
I hope this helped.
ELM