@DanAdair No problems. You can also find the widgets used on the categories page here in the same area (widgets) - you just need to add them as they are not by default.
@oplik0 the SMTP didn't work either. But thank you very much for pointing at the other services! I've just tried SendGrid and it worked perfectly from the 1st attempt.
The setting @julian describes belongs to the browser (chrome/chromium in this case), not NodeBB.
If you're using chrome/chromium, press F12, then F1 to show the options. Check the option and keep the tools open while refreshing the page to ensure the cache is disabled.