Boss mode not accessible in new Xbox one smartglass app

Hi just had to update the Xbox one smartglass app on iOS. Now I can't get into boss mode via the companion feature on iPad.

The companion screen doesn't scale properly on iPad and I can't see or press on the boss mode button.

I really like to play the boss mode with my dad.

Please fix this issue asap.

Would also be great to have it in GW2. ☹️

Thanks