Setting Up Full Width Articles
To have Knowledge Base articles with full page width, choose one of the following:
A ) Your theme settings
Some themes have settings that toggle your sidebar options. See your themes documentation or contact your theme author to see if this option is available.
B ) Knowledge Base Settings
C ) Custom Coding
If the above does not work, customizing your template files is another option. Please note these are for developer and support is not provided at this level of customization.
To Customize your current theme templates – see details here.
For more details about templates setup for Knowledge Base pages see details here
Full Width, Article, Blog, Sidebar, Full Page