the ability to set channels to private or public after there created

for someone new to discord servers when they find out they can make channels only be seen by people with certain roles  so they try to edit there channel and there is no option to make channel exclusive to a role 

and its only available during the creation of it which means it would have to be deleted and remade with the correct setting losing all the content the channel had before it would be great for server owners to be able to make current channels private when ever they want and be able to make them viewable to only people with certain roles