When you upgrade, your additional styles will still remain; delete them if you don't want them.

If you are upgrading and you want the new styles, install them from the install directory with the style editors import function; they reside in the /install/styles folder and can be imported like any other style.

The larger don't style at UBBDev is simply a style who's font size has been configured to be larger. I offer styling services at www.virtualnightclub.net

Mobile users have sidebars disabled and they can trigger them to be visible by clicking the link at the bottom of their browser. This is the optimized approach as sidebars will make the forum very difficult to use.

You should place your advertisements at the top and bottom of your site (the advertiser island can place ads within your posts). Be sure that any ads are using a responsive system (Google for example offers these, they will change sizes bases on the screen width).

You can adjust your sidebars to have one side bar visible for tablets, but it's not currently in the software by default.

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
Do you need Forum Install or Upgrade Services?
Forums: A Gardeners Forum
UBB.threads: UBBWiki, UBB Styles, UBB.Sitemaps
Longtime Supporter & Resident Post-A-Holic
VNC Web Services: Code Modifications, Upgrades, Styling, Coding Services, Disaster Recovery, and more!