REVIVING THIS THREAD TO CONTINUE WITH ADDITIONAL INFORMATION
The conversation prior to this post were regarding UBB.threads 7.6.0.
This reply is regarding a feature added to UBB.threads 7.6.1.---
If your forum layout is not completely mobile friendly (responsive), it is advised that until you are able to resolve this, that you Toggle the "Disable Viewport" setting at Control Panel > Primary. This includes if your forums are using any Site Navigation in the side custom-portal islands. As all site navigation should be in the top/header section of each page.
Disable Viewport
This will disable the viewport. The viewport element allows your forums to conform to devices with smaller screens, such as smartphones and tablets.
This feature was added in UBB.threads 7.6.1
SOURCE:
https://www.ubbcentral.com/forums/u...e-ubb-threads-7-6-1-changelog#Post260649[NEW] Responsive layout on mobile devices (viewport) can be disabled from the Control Panel. This setting disables responsive pages for mobile devices such as smartphones and tablets. All pages viewed on mobile devices will have a desktop style layout similar to the old non-mobile versions of UBB.threads (v7.5.x and older).
note: I received PM with this same question. It's always been in the best interest for the group to post those types of questions to the public forums so that others with the same questions can benefit from reading the answers.