How do I expand/collapse email folders on Samsung Galaxy S6/Android 7.0?

[AC Question]

I have several folders and sub-folders on the pre-installed email app on my Samsung Galaxy S6 and cannot find a way to collapse any of those folders. This makes it extremely frustrating due to the extended time it takes having to forever scroll to get to the specific folder I need. Does an expand/collapse feature exist??? Please help!!

Thanks,
Melissa