Add the custom sidebar to category page

Hello,

I'm trying to add the custom sidebar name "medium-sidebar" to the category page in order to make it display like the screenshot 1. I'm using the option at the edit category page like the screenshot 2 but it not works.

e.g. add the medium-sidebar to this category.

Could you help me using the grant access to take a look?

Thank you,
Tuan.