Enfold masonry gallery – minimal scroll bar

I have a client site with tons of images in a masonry gallery, 300+.

After upgrading Enfold(v.6.0.6) & WP(v.6.7) recently, the vertical scroll bar inside the popup when adding images to the masonry gallery changed to a minimal style (just a thin gray line rather than the normal thicker line with a box inside it) and the “home” and “end” keyboard shortcut keys no longer work to instantly jump to the top and bottom of the gallery. The thicker normal scrollbar is normal everywhere else on the back and front ends. I need the shortcut keys to work, otherwise I have to “drag” an image all the end to one end of the gallery manually and it takes forever!

Is there any way to get the normal non-minimal scrollbar back for the gallery popup? Using Avia Layout Editor, running firefox on Windows, but I get the same issue in Edge and Brave. I can share a screenshot, just not sure how to do that in this post.

Please tell me there is a solution. Thanks.