Where is frappe ui toolbar add_dropdown_button?

Where is frappe.ui.toolbar.add_dropdown_button ?
I cant find UI folder. Where is it ?

Use global text search / grep :slight_smile:

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However . When I delete UI Folder , System run, not Error.

You have to build JS / CSS files.

bench frappe --build

Thank you. But I can’t use bench

when i reinstall ERPNext . I can’t use Bench.