Steps to reproduce:
1. Navigate to Configuration > Mobile Device Families
2. Add a new Device Family by clicking the blue +
3. Fill in Name and Description.
4. Add Classification Rules
5. Navigate to Site Builder > Pages
6. Add a new Page named as "MDR Page".
7. Navigate to the "MDR Page" Configure page
8. Navigate to the Advanced tab
9. Disable "Use the same mobile device rules of the Public Pages" under Mobile Device Rules panel
10. Select mobile device family from step 2.
11. Add an action for the Device Family
- Select Type: Theme Modification
- Select Theme: Porygon
12. Go to Site and navigate to "MDR Page".
Mobile Device Rules is set up for public page.
No changes when viewing page.