I know there are different questions and answers to this, but they are old or have a different approach.
I have added some existing site columns to a list via "Add from existing site columns". Now I want to remove some of them.
There is a way to do this with Powershell, but I need a GUI to do this for other employees. They are not able to work with Powershell and if they do not remove old columns, the list management will get very clunky over the time, because of all those unused columns.