That's cool, but it appears to be limited to the view. I can't remove the column from the folder. Did I miss something? drulli 

This is the same in folders: the infamous "all" view is read-only. You need to set a different default view in the system configuration section.

drulli, but it seems a little inconvenient to create view for every folder, in particular there are many folders...

As far as I understand Jenkins' view concept you simply need to define one new view that will be used as default for all your folders.

drulli, no, it seems not, I have configured a default view in the system configuration section, and a default view in a folder, but other folders does not follow the changes.

Hmm, can you check if there is already an existing issue in Jira? And if not, can you create one? It makes sense to change the default view of Jenkins and all folders. (Actually it would make sense to change that on a per-user setting).

This would be also an interesting topic for the UX SIG chat, see https://www.jenkins.io/sigs/ux/ for the details.

drulli, 
I searched extensively and viewed roughly for 'column' and 'view' in questions over the past 30 weekends but didn't encounter any issues as you described. Also, the link you shared isn't working; it shows 'The link you have entered is not valid'.

It seems that the links in Matrix are wrong, you can look at https://www.jenkins.io/sigs/ux/ for the correct one using Gitter.

This needs to be done in core.