Forum Discussion
Hide Left-Hand Navigation in Document Library/Lists on SharePoint Online
JeremyBritz Click on the arrow to hide the header and left navigation.
JeremyBritz I think you are using team site in SharePoint online. Microsoft recently released new features for team sites using which you change the orientation of left navigation (vertical) to top navigation (horizontal).
This is a permanent solution for moving left side navigation to top side. Solution given by PamDeGraffenreid works but it expands the page & open it in focus mode temporarily.
Find more information at: New Navigation features for SharePoint team sites
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