If you quote text from the previous email history, it will be indented to mark it as a quote. This setting allows you to set
the extent of the quotes.
Tap the profile icon in the upper left corner (containing your initials
or profile picture).
Scroll down a little and tap Settings.
Tap the activation button under Increase Quote Level.
When the switch is active (right position, shown in green), the quote level is increased, i.e. the quoted text from the old
email is displayed indented.