How to change the theme color of OEM App?

First, you need to log in to the IoT platform and click "App—App Creation—Create" to create an OEM App. After completing the required items, you can start to set the App colour theme:

• When the template version used by your app is earlier than v3.23.5, you can set the theme color of the app. You can choose from a variety of preset color schemes, or customize a color scheme.
• When the template version used by your app isv3.23.5 or later, and earlier than v3.25.2, you can set the theme color, background color, text color, round corner style, and other preferred styles.

For more details you can see：https://developer.tuya.com/en/docs/iot/app-development/oem-app/create-an-oem-app/appautobuilding?id=K97dki9m38d8w