Cannot update AMP appearance

Hi. I just installed this plugin and I like that it has a lot of options to customize the look and feel.

I’m having trouble with updating the appearance of my AMP pages, however. I am trying to edit it via Dashboard > Appearance > AMP but all the options in the left side disappear soon after the page preview loads and I am unable to do anything. If I click fast enough, I can click on AMP and then Design, but that’s about as far as I can go. For a split second I can see the options presented under Design but then they disappear and the left sidebar is just blank with “You are customizing [site title]” at the top. My only option is to click the X and exit the customize page.

I also tried going to Dashboard > Appearance > Customize to see if there would be an AMP option somewhere in there but there is not.

I run into this same issue when trying to edit in both Firefox and Chrome browsers.

Any help would be appreciated. Thank you.