Oppo users have the ability to customize the look of their devices by using themes available in the Theme Store. However, most of the themes in it require payment.
themes
How to Change Samsung Galaxy Themes for Free Without Apps
Every Android smartphone is now equipped with a default theme app, so we don’t have to bother downloading third-party apps to change the appearance of our Android smartphone. We can usually use themes to change the appearance of our smartphone background, icon icons, notification display, setting menu menu, and much more so that our smartphone