I would expect the wallet to look like the below image when you choose “send”

You set the fee separately by clicking the ▼ drop-down fee selector in the “Fee” section near the bottom of the screen just above the “Continue” button. So the amount you enter in the “BTC” section is the amount for the recipient excluding the transaction fee.
If your wallet looks different, you could contact customer support provided by the business that provides your wallet.










