How To Remove Notebook From Quick Launch In SharePoint Online

Here, I am explaining how to remove the Notebook menu from Quick Launch menu. Notebook is the default feature of SharePoint online. When you are creating a Site collection in SharePoint online, the Notebook option is automatically visible in the homepage.
 
Step1 

Go to Site Collection -> Site Settings.
 
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Step2

Go to Manage site features under Site Actions section.
 
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Step3

Go to Site Notebook and deactivate it.

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Step4

Deactivate this feature.

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Result

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