Render partial view overwriting the same page in Express JS - node.js

I am having a grid records and a button at the top of the grid. Once a record is selected from the grid and button is clicked, I have to render a partial view with a form inside. I don't know how to render partial views from controller. Please find my folder structure below:
--views
--partials
--header
--footer
--main
--form_page
--route
--index
--api
--grid
Header and footer is default for all the pages. Initially main page will be rendered as partial view. I have to replace it with form_page after the button click. It is based on express js and handlebars.

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