Hi,
if you have downloaded this from market place
https://marketplace.mendix.com/link/component/117326
it is a widget and not a module.
So it will be available in widget folder in your project files.
to add it in a page you need to right click on a page and click on add widget .. you can choose custom drop down in that list.
Also, widgets will be available in tool box.
Hi Priya Sopan,
I hope this is the custom dropdown widget you have downloaded from the marketplace, Mendix Marketplace - Custom Dropdown
This is a widget, and it is available in Widgets section as show in the below image.