How to Hide "Notebook" from SharePoint Online Quick Launch?

Requirement: Remove Notebook link from SharePoint Online quick launch navigation.

How to disable Notebook in SharePoint Online?
When you create a Site collection in SharePoint Online, the Notebook feature is enabled by default and the left navigation has a link to it. Here is how to hide the notebook link:

• Go to Site Settings >> Click on "Manage site features" link under Site Actions section.
• Scroll down and find the "Site Notebook" feature
• Click on "Deactivate" to disable the feature.
  
• This removes the "Notebook" link from both classic and modern SharePoint Online sites.
  
  

Activating "Site Notebook" Feature again brings the Notebook link in the left navigation.

You can also use "Navigation" under site settings to remove the "notebook" link from quick launch or use "Edit Links" feature!