Many times we want to hide the quick launch or left navigation from your SharePoint Modern Team Site collection:
Hiding the left navigation will help you to cover the full width of the page in your modern pages and have beautiful ShortPoint full screen elements.
Important: this will not work if SharePoint Server Publishing Infrastructure feature is enabled in your site.
Steps to hide quick launch / left navigation / left menu / side navigation
Step 1: Go to Site Settings
Click on site Information
Click on View all site settings
Step 2: Disable Quick Launch from Navigation Element
Go to Navigation Elements
Make sure both Quick Launch and Tree view is unchecked
That's it! Now you will not see the quick launch in your Modern site pages!