Activate the Lightning Record Pages You Create

To make Lightning record pages available to your users, activate them. You can activate a page when you save it for the first time or later using the Activation button.

1. From Setup, use Quick Find to find and select Lightning App Builder.
2. Click Edit next to a record page you created manually.
3. On the Record Page, click Save, then click Activate.
   
4. Click App, Record Type, and Profile, then click Assign to Apps, Record Types, and Profiles.
   
5. To activate the record page for all users, select all the Lightning Apps. If you're testing the record page, select only Sales. Then click Next.
   
6. You don't need to change the selected form factor. Click Next.
   
7. On the Selected Record Types window, select all the record types you want to appear on this record's page, then click Next.
   
8. Select Standard User and System Administrator profiles, and any other profiles needed for your organization. Then click Next.
   
9. Click Save.