Tap on your wallet’s icon on the top left of the screen. This opens the “Wallets” screen, where you can view your wallets as well as wallets in your watchlist.
Press the “Edit” button on the top right of the “Wallets” screen.
You will see three dots appear next to each wallet. Press the three dots to open the “edit wallet” menu. From here, you can select “Delete wallet”
You will see a warning, informing you that deleted wallets can only be restored by importing the secret phrase. When you press “Continue to delete”, there is an extra precaution requiring you to type the wallet’s name in order to delete it.