Aurora - unable to change font feature

Hi, just wondering if someone can provide some guidance on something really basic.
Maybe I am just being dumb but can’t figure it out.
Using aurora-dx:stable, up to date.

I am trying to enable a Font Feature in “Fonts”. I have changed the font to Inter, but I am trying to enable the ss02 font feature. I can type it in the box, press apply, see that it takes effect, but once I close the window this is reverted and if I reopen “Fonts” it’s back to what it was.

Should I be doing this in a different way?

Did you log out and back in?

I restarted the machine entirely, to be sure, before I posted this, no change.