All windows are not displaying context menu when right clicked on theirs title bar. This used to work with a fresh install but it's not working any more on 2 recent installations. I do not know what caused the problem and I do not intend to remove all installed programs (or to reinstall Juno) to find out.
Any pointers would be a big help.
This is related to a Loki issue but not the same, at it is for all applications and all users.
EDIT 29 Nov: I am not looking for a way to minimize the window: I can do that.
I want the title bar menu as it provides a menu to choose on which workspace the windows is to be displayed: one particular workspace or all workspaces.