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vishal yadav 86vishal yadav 86 

Create Custom Side bar Component

I have one requirement to create a custom-sidebar component on lead standard page
VinayVinay (Salesforce Developers) 
Hi Vishal,

Unfortunately, you cannot create a custom sidebar on standard page.

You can make changes on home page component but sidebar would reflect on every object.

https://help.salesforce.com/articleView?id=home_page_components_custom_create.htm&type=5
http://thesalesforcetutorial.com/basic/homePageComponent.html

Hope above information was helpful.

Please mark as Best Answer so that it can help others in the future.

Thanks,
Vinay Kumar