Have the Pro installed on J4.2.8. Is it possible to set the overlay color? The dark theme s awfully dark, much darker than it was in J3. I have tried using the "opacity" and it doesn't seem to make any difference. "0", "0.1", and "1" all result in exactly the same dark color.
PS: When Modals open the header (data-modals-element="slide-title") shows up with a vertical scrollbar. Setting the line-height for it to 1.3 fixed that. 1.27 was enough to remove the scrollbar. It is set to 1.2 in the Cassiopeia template, at least that's what it shows up with.