Option to open all sections of the custom form

[#1]

Description -

With the ability to now toggle the sections of a custom form open or closed, we would like a button or something that allows us to change all sections to open without multiple clicks.  We have a form with many sections and it would be easy to miss if someone collapsed a section. It would be nice to have the ability to open all at once.  

Current Behaviour - Currently can collapse each section separately, but no way to open them by one click.

[#2]

I am surprised Product Manager overlooked such a basic functionality.

[#3]

I would add the ability to open AND close all sections. This is a pretty basic function that should have been there from the start. On the Mac, you can hold the option key to expand or collapse all folders. You can do this in most Linux flavours by using the asterisk key.