I know how to configure the Wishlist in the Theme Settings, I’ve done that already.
My problem is when I am trying to modify the Wishlist page itself, as for example changing the background, title, button, I can’t because as shown on the picture I shared, on the top right, nothing appears inside that popup where there should be more settings.
You can change the font by means of the Advanced typography option, which allows you to choose the item from a drop-down or insert your custom CSS class. Please navigate to the Theme Settings > Typography > Advanced Typography.