I have an iPhone SE. I have my iCloud email and a gmail account in the Mail program. When I open an email in the gmail account there is an archive button. But when I open an email in my iCloud account there is a trash button. How can I get the archive button to display on my iCloud like it does on my gmail account? I know how to get to the archive button in the iCloud account, but I wanted to know if these buttons are customizable.