Although the Galaxy Apps store does not promote DeX directly, it does promote your DeX-compatible Android apps using:
Galaxy Apps in-store promotions
For details, see Promoting within Galaxy Apps and the Theme Store.
Promotions outside Galaxy Apps
For details, see Promoting outside Galaxy Apps and the Theme Store.
These promotions are based on information, graphics, and videos registered with your apps. Samsung also assists you in promoting your apps through advertising channels outside the Galaxy Apps store, including download discounts and coupon codes.
You can promote your app's DeX compatibility in your app and media channels.