Per the demo you should be able to remove irrelevant columns, but I do not see the 3 dots just a number adding up the number of tickets, this leaves me able to still see in view the later and no field value columns?
I just tested this and it's working for me. I'm able to remove the columns using the 3 dots menu.
It's possible you may not be an admin/editor for the project which you're viewing. You should check with your project owner to see if they can grant you access to edit the project.