Option to open all sections of the custom form

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.