Tabs appear on the side rather than the top. Subpages and even headings can be displayed as nested tabs. The page content will be in a single column, vs. multiple columns.
Your organization may have specific organizational branding and a style guide so discuss with your system administrators before you change your guide's layout.
If you change your layout from multicolumn to single column, the content display order will put whatever was at the top of your left most column first, then work down, then to the middle and down, and finally to the right and down.