All of your positions may not apply to the MTM election. It is possible to have some trades meet the qualifications and be entered on Form 4797. Any trades that are still long-term are investments entered on Schedule D.
Here is a partial answer from @AnnetteB6 that helps to explain the difference.
If you have not elected and submitted the Mark-to-Market (MTM) accounting method, then go to Forms Mode to view your Schedule D. Line 16 of Schedule D will show the overall gain or loss being reported on your return. . Otherwise, you must do some math outside of your return to determine only the overall gain/loss from transactions associated with your business as a ‘trader’. Transactions as an investor (for example, selling a long-term holding) cannot be considered to be income associated with your business as a trader.
If you have elected and submitted the MTM accounting method, then go to Forms Mode to view your Form 4797. If you have no other items reported on Form 4797 except for your trader activity, then the ‘trader’ gain is the amount from line 18b. Otherwise, you will need to calculate the total gain for your trader activity only to use in the home office instruction below.
