With Android 10 we received the update for the universal Dark Theme, but to be able to toggle it on or off according to each app is always better. Now, Google is experimenting this feature by adding the same toggle to the Play Store.
To choose which mode you’d like to use, fire up Google Play, head to Settings, and look for the Theme section. You might not see this right now, as it seems Google is enabling the feature server-side rather than through an update to the Play Store app. The update is rolling out now, so if you can’t see it yet then you may have to wait a couple of days for it to arrive.
For now, only phone running Android 10 are gaining access to the new dark mode toggle, but this may change further down the line – you’ll just have to keep checking to see if you’ve been graced with the option.
Source: Android Police