CSS class dropdown menus unstable

hi,

I’m liking the plugin. There’s one thing that’s a little funky and I wish to have it improved. In editor mode under the settings panel in the Core Framework section where you get to select CSS classes to apply to a design block. The CSS class dropdown menus tend to jump around and get finicky making it hard to scroll down and select the options. I’m hoping there’s a better setup to select the CSS classes.

Thank you.