collapsing folders and subfolders in mail

Hi,

I know this question has been asked many times and the answer from Apple is always the same, "No, not supported". Submit you feedback. Period!

Many people have posted feedback, since 4 or 5 years, but still nothing in the radar.

When is Apple planning to implement the option to collapse folders and sub-folders in the iOS Mail app? I have on my laptop multiple hundreds of folders/subfolders for my business. I need to use my iPhone during out-of-work windows. It is impossible to retrieve quickly folders of interest. All folders are listed at the same level. This is useless.

I'm wondering if Eng people from Apple use their iPhone to read email.

Thank you,

yves