How the Alternative Logo works
There are two logo upload options in the theme: the main logo, and the alternative logo. How it works is the standard header (non-transparent) and the sticky header always show the main logo. This is because you can choose to have your header background either white or dark which is a site-wide option.
The alternative logo is an option specifically for the transparent header which can be enabled per-page, since some pages may have a dark page header and some a light header, etc.
So it's possible to show a different logo by a) using the transparent header and b) by toggling the alt logo on: https://cl.ly/0R1e3g0j271O
Both logos are added under Appearance > Customize > Theme Options > Logo
If you have any questions, please feel free to open a ticket.