Equal height columns not working

I am trying to make equal height columns, i have followed this tutorial here https://wpbakery.com/video-academy/how-to-create-layout-with-equal-height-columns/, but not working at all. I dont know why, the plugin version is 5.4, Is there any bug or Do I want to do some other config that not mentioned in that video.