RadzenDatagrid - ColumnPicker

I use AllowColumnPicking and it works like I expected but I could not menage to have first field in dropdown with the value "All" like in your example so please what have I missed?

This functionality is available by default unless you have set AllowPickAllColumns to false. Yo can check the code if you have further questions:

Thank you for your answer. I tried but the option looks like it is not recognized so it does not work. I am using the newest version of Radzen components 4.29.1.

My bad. This is not what I have to set. You are right, I set AllowPickAllColumns to false way before I tried this Pick option. Now it works.
Thank you again.