Only the net gain on the sale of the stock would show on your tax summary after it was combined with other capital gains and losses you entered. You can see your net capital gains listed on line 7 of Form 1040. If you have more then $3,000 in net capital losses for the year, only $3,000 will show on line 7 of Form 1040. You cannot adjust entries on Form 8949 directly, you would have to edit your original entry in the Investment Income section of TurboTax to change the entries listed on Form 8949.
To view your form 1040 and schedule 1 to 3: