You are customizing a model-driven app for a company.

Box 1: Upload the theme elements as new web resources.

Each type of icon is stored as a web resource. Create a web resource first and then set the icons to use them. Alternatively, you can add the icon by creating a new web resource when you define the table properties.

Box 2: Replace an existing UI item's hexadecimal number.

Copy and alter the existing theme

The easiest and quickest way to create a new theme is to clone and alter an existing theme. Then save, preview, and publish it.

Sign in to Power Apps, select Settings icon (upper right), and then select Advanced settings.

Select Customizations, and then select Themes.

Under All themes, select the theme you want to clone, such as the CRM Default Theme. Select Clone on the command bar.

Replace an existing UI item's hexadecimal number, such as the Title Text Color, with the hexadecimal value that represents the color you want.

For example, the CRM Default Theme was cloned and changed using mostly varying shades of green color. The following screenshots show the new colors for navigation and highlighting. A custom logo was also added that will appear in the upper left corner of an app.