We can easily find some workarounds to hide the left navigation bar on Sharepoint using CSS…. But I wanted to remove it on a specific page, without using any CSS.
It’s actually pretty simple. You need to add the below tag into your .aspx page:
<asp:Content ContentPlaceHolderID="PlaceHolderLeftNavBar" runat="Server"></asp:Content>
Tested with Sharepoint 2013 On-Promise.