Any User can access the default Minimalist Theme, as well as a blank Theme from within any Project. In order to access other design.efficiently Themes or any custom branded Themes created by the Org's Administrator, the Admin will have to add these Themes into their Org for use by other Users.

To add Themes to your Org, follow the steps below:

Step 1: Navigate to your Admin Console, and select the Book Themes tab.

Step 2: The Themes listed on the side (the default Minimalist Theme and a blank Untitled Theme) are shown for all Users from within any Project. To add another Theme to your list of options, click the blue '+'.

Step 3: Select the Theme you wish to add to your Org from the list on the left and click Select Theme in the bottom right corner.

Step 4: Name the new Theme and click Create.

Step 5: You will be taken into the Theme, where you can edit any of the Pages or Book Layouts associated with that Theme, by selecting from the tabs on the left.

Step 6: Your new Theme will now be available to all Users in your Org at the Project level. Click < Themes to return to your full list of available Themes.

Note: To create your own Theme, select the blank Untitled Theme and edit to your liking. You can add additional blank templates by selecting the blue '+' button.

To create your own Theme specific to your brand, take some time to review the article on Customizing Book Themes.

Full video overview of the above step-by-step guide: