[split] User guide doesn't display properly at narrow resolution

Your problem makes sense now. I can't reproduce it on my system though ... the user guide displays properly at all window widths using Firefox 45.1.1 on Centos6. This could be an issue with your platform or the browser you are using.

Some of the other devs use Mac, and might be able to reproduce it. You might, however, have to wait until the first version is "released" before the problem gets looked at in depth.