Mahesh, thanks for your time and sorry to be difficult, but things temporarily resolved and returned. Problems are with mobile site and are confirmed by another party.
1. Menu issue: I already had a specific custom menu uploaded via the procedure you describe. It displays fine except in mobile, where it wants to add all top level pages, whether they are included in the menu or not. (I have the box unticked to automatically add it in.) eg. The page BLOG should not be displaying in the menu but it is on mobile.
2.1 Sidebar: Can I not have the default setting be No sidebar, then override on specific pages and posts? It is successful on my desktop computer. Even displays properly in mobile when everything else is working okay. (eg. On http://janohara.net/archives/ I have selected content/sidebar and Optional Sidebar One.)
2.2 & 2.3 Footer vanished again at same time as sidebar. When this happens, I get the wrong menu displaying and the color vanishes from around the site title and tagline. Have taken screencaptures via my phone and uploaded to http://janohara.net/blog/ so you can see what I mean. When this happens, the front page below the tagline turns into the last 5 blog posts, full content instead of archived content settings.
In other words, when it goes wrong on mobile, it all seems to go at the same time.
3. Thank you! I will try modification, perhaps, in the future but am more concerned about fixing the stuff above.
Appreciate your time!