ELI5: Dropdowns in 2023... How does this work?

Edit: I realized I was confused about what functionality was actually deprecated. Nevermind.

Welcome to the forum!
Since the dropdown is deprecated, you may want to consider using a form? Not clear on what the intent is as far as your design of the application. I am sure though that there are numerous options and ways for you to build something for your company. My 2 cents...