how to setup/use depending input fields

Hi 👋

I would like to know how to setup/use depending input fields.

Basically, my actor will have a drop-down select where users can select either scrape products URLs or scrape search results page.

Here's my goal:

• If the user selects "scrape products URLs", he should be able to add as many URLs as he wants
• If the user selects "scrape search results page", there should be a single input string (removing the ability to add others input string fields)

How can I set this up? Thanks 🙏