How to change Text Box to Select Box in Opencart 3?

When I upload product in Opencart-3 and search Categories in Links > Categories then the Categories will search and show as a Drop Down but Searching will take a lot of time, it is taking 2 minutes at least for searching categories only. then what I need to do? I am looking to make it "Select Box". So how to convert this text box to select box? I think the select box will not search and show the categories faster.

You can check the below image so that you can get my point:- https://i.ibb.co/0JpKF5Q/opencart.jpg

Please help. cz' i am fed up.

Use this module : (Free)

https://www.opencart.com/index.php?rout ... n_id=34195

it is not installing by installer. I extracted it. it is only an .xml file,
so In which Folder do i need to upload the file?

Thank you
vivek