Fixed buttons on product page (Add to Cart, Wishlist, etc.)
The sticky buttons on the product page can be controlled from the Journal > Styles > Product Page > [Active Style] > Buttons > Display.
You'd leave it on default on desktop and then add a breakpoint like 1024 and change it to Fixed. Then in the same section in Container Styles you can add background and other options on the same breakpoint if needed.
The option can be applied on a breakpoint rule so it only kicks in at certain resolutions, (green plus button on the right side of the option). You apply a rule, indicate a screen width, and change the option. So any screens below that width will apply the different option state.
Learn more about our breakpoint options here: https://docs.journal-theme.com/docs/variables/breakpoints/