Not unless Yahoo wants to. There is a complaint button on the PC.
From another forum:
"In this latest version of Yahoo's Full UI, there is a link called 'Send Feedback', located below the folders tree."
If you can't see it in mobile, you may have to use a desk or laptop. A lot of people were using mobile to avoid the new Yahoo UI, so there will be complaints if Yahoo is messing with Mobile.
You can get "Classic" back now on the PC, anyway. A lot must have slow devices.
If you can set your browser to desktop mode, see if you can find that setting and use the browser rather than the app.
Another quote from the same forum:
"Click the gear icon on the right upper side.
Go to settings and then to viewing email
Scroll to bottom and choose mail version "basic" and go back to what it was."