How to customize the side bar on Workspaces pages?

Frappe Framework Customization
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Hello!

For this side bar, on all Workspaces pages,

image
image1304×915 79.2 KB

I want to customize its functions.

Specifically, I am willing for things like adding frappe.session.user’s photo, name, greetings, etc.

  1. What files should I look for?
  2. How to override those files / store the changes in my custom app?

Regards