Check this article about collapsing menus:
I heard a rumor that this may not work correctly in 2018 Tableau, but I haven't had a problem.
I was going to describe for Arun exactly what's in the article you linked.
I used to pop out the container of filters and params over top of the actual dashboard, but the new behavior introduced in 10.4 Server whereby we can no longer "drill through" to the underlying objects when the display container collapses away, forced me to hack up the same thing described in the article you linked.
This works. And (for me) still works in V-2018.