No you can enter all your trades here. If you have other 1256 contracts besides Marked to Market, you can go back to the original entry point, check no box on the first screen, then check any that apply on the second screen and report your trades.
From IRS Instructions for Form 6781:
"Mark-to-Market Rules
Under these rules, each section 1256 contract held at year end is treated as if it were sold at fair market value (FMV) on the last business day of the tax year. The wash sale rules don’t apply. If your section 1256 contracts produce capital gain or loss, gains or losses on section 1256 contracts open at the end of the year, or terminated during the year, are treated as 60% long term and 40% short term, regardless of how long the contracts were held. The mark-to-market rules don’t apply if you properly and timely identified a section 1256 contract as a hedge."
@Jim4AU
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