This is not a topic for Bitcoin discussion board. It would fit better in Meta or Beginner's & help.

There is no mobile version of the website as yet and that's the reason for the horizontal scrolling, one has been suggested multiple times and is available on the new forum software AFAIK, but at this time it's not available yet.

It takes some getting used to if you start off using the forum on PC, but you should get a hang of it with time. I use the forum on mobile (doing so right now) and don't encounter any issues.