Is it possible to revert to previous email layout after iOS 18.3 update?

Yes, there is. To change your Apple Mail back to the original email view, open the Mail app, navigate to the top right corner, click the three dots (More options), and then select "List View" to revert to the traditional email display format; this essentially switches back from any categorized view to the classic list view. I did this myself.

My mail app has lost its Select and ability to delete multiple apps (after 18.3 update). Directions tell me to hit 3 dots to right corner to List view but that does not show up on my screen. Been at this several days, very frustrating

I opened the mail app, touched 3 dots and selected list view but it did not change the look of my email. I don’t like the categories!

I tried that and it did not go back. Any other solutions?

Same and I missed some key emails… I am going to go into the store, which I was hoping to not have to do.

I do not like it at all. All very confusing and I tried the three dots also