That works if I am using the header options in the Theme Settings. However, I was using the header builder, and it seems to still be an issue even if I set the settings as you described.
I had to go into the header builder and change the cart option on both the desktop and mobile. Very confusing option, especially since I would prefer having the sidebar on mobile, but the header widget on desktop. It appears I cannot have that option.
I have figured out a workaround. I would still consider it a bug. On mobile, I would much rather have the sidebar cart, while on desktop I would prefer the dropdown.
Having both would be a great feature and it works fine except for the fact that the add to cart opens both.
On the mobile, the shopping cart will always be on the side, regardless of the selected option, but for correct work on the mobile should be selected option such as on the desktop.