Don't like one of your page layouts on your SharePoint Site? No problem, you can solve this problem quickly and easily using the free SharePoint Designer. It doesn't take any programming, just a couple minor HTML tweaks.
Note: This is different from modifying the master page, which will effect every page on the site. Instead, we'll be detaching the page from the master page, therefore making it unique on the site. This obviously has its cons when its comes to long-term site style.
Here's how a site looks, out of the box:

Notice how the "Right" web part zone is narrow, and the "Left" web part zone takes up the remaining part of the actual page content. I don't like that…its backwards for me. Here's how to change it:
- Inside SharePoint Designer 2010, click "Open Site", type in your URL, and click "Open".

- Click "Edit site home page".

- Now the default.aspx for the page will appear. Areas that define the page layout itself will have a highlighted background color. Those lines cannot be changed unless you enter "Advanced Mode". So first, click the "Advanced Mode" button found on the Home menu (top right of your screen in the ribbon). Now, looking at the HTML of the page, the part I want to change is near the bottom, and is the width of the two main WebPartZones on the page (the "Left" and "Right" Web Part Zones)?
- Finally, just save the site in SharePoint Designer and then close it. When you save, your changes will be written to the SharePoint Server, so the next time you visit your page, it will appear as desired:
