This would actually be a 2-column theme. One column containing your main content, and another column containing your sideblocks. I don't recommend using a left-column only hack. In fact, I don't recommend using a right-column only hack either. I think that since Moodle doesn't natively support themers to make this decision, then we shouldn't really hack things just to make it happen.
More specifically, though, if you were to hide the right column from your users, you would have to display it to your teachers when editing is turned on so that they could see the blocks menu. This would be quite confusing since Moodle would still allow them to place their sideblocks in the right column. They might place something there and then wonder why it can't be viewed when they turn editing off.
Furthermore, I believe that the "Turn Editing On" link is in the right column on the front page. So, if you were to hide that column, you would lock yourself out from editing that page.
To do this really is a hack.
Furthermore, I believe that the "Turn Editing On" link is in the right column on the front page. So, if you were to hide that column, you would lock yourself out from editing that page.
No problem, you would still have the Turn editing on button available (see screenshot). Other than that I totally agree that you cannot have a one-column only theme in Moodle. On the other hand I personally dislike the 3-column layout and much prefer a 2-column layout.
Joseph

I have also changed (Hacked) the moodle code so that the 'Turn editing on' button on the front page is displayed in the left hand column.
Further to this I have hidden the icon to move a block to the right.
Next I'll be editing the default block layout settings so that all 'default' moodle blocks appear on the left hand side.
http://docs.moodle.org/en/Block_layout
Hope to release the code back to everyone soon!
Edit: I have also set the #right-column to display: none;
Hi Dan,
I do not see the necessity to hack the Moodle code to achieve a 2-column display. It can be achieved entirely through your theme's CSS stylesheet. There are a few (very few) 2-column themes in the Themes repository (including my own orangechoc theme, a little outdated now).
Unless, of course, you need to force all teachers on your Moodle site to use a 2 column display with the blocks in the left column.
Joseph
Right column is easier because you dont have to move the add block menu or the turn editing on button on the front page so I can see how the OrangeChoc theme could easily be done in CSS.
This forum seems to know quite a lot about editing themes and I was wondering if you could possibly give me some help.
I am using the "theme with automatic Menus bar", by "Chen ZhongWei" and was wondering if anyone had any guidance as to how to resolve a couple of issues that (being a moodle novice) are probably easy to resolve with some help .
These issues are:
Issue 1 - How to change the colour of both the static and hover links on the breadcrumb menu?
Issue 2 - Which css allows you to edit the orange line just above the footer image?
Issue 3 - I have managed to change the alternative text for the icons but I cannot change the alternative text for the logo (it still states faculty of Computer and Information).
Issue 4 - How do I move the logo so it sits at the very left hand edge of the page?
Thank you for your time in this matter.
Alex
CSS FAQ and Themes FAQ are good starting points for solving theme related issues.
hth
Frank