From the Home screen, tap the Google folder > Gmail .
Swipe from the left side of the Gmail Inbox screen to open the Accounts and labels menu.
Tap Settings.
Tap General settings to change the following settings for all accounts.
Archive & delete actions: Sets if you want to display only the archive option, only the delete option, or both options.
Swipe to archive: Checkmark to archive a conversation when you swipe it.
Sender image: Checkmark to display the sender’s image beside the name in the conversation list.
Reply all: Checkmark to make Reply all the default message action.
Auto-fit messages: Checkmark to shrink the messages to fit the screen and allow zooming.
Auto-advance: Sets which conversation list is viewed after archive or deletion. Choose from Newer, Older and Conversation list.
Message actions: Sets when to show the action icons on the message header. Choose from Always show, Only show in portrait, and Don’t show.
Confirm before deleting: Checkmark to ask to confirm before deleting a message.
Confirm before archiving: Checkmark to ask to confirm before archiving a message.
Confirm before sending: Checkmark to ask to confirm before sending a message