Box 11c is for Long-term capital loss carryover, so you shouldn't be able to report this as non-passive income. The nature of long-term capital loss is passive. Other lines like 11d can be deducted but not 11c.
You can let me know why you think it's non-passive in the comments below or you may want to talk to the company that reported it to you, if you think they made a mistake and intend for it to be fully deductible.
If you weren't able to enter the amount, note the following:
When entering your schedule K-1 for a trust, one of the first screens you come to is titled, TRUST NAME and it asks if this is the final K-1 you expect to receive. It also says, Note: Answer "Yes" if you have an amount in box 11 If you weren't able to enter your amount, it's because you didn't answer yes to this question.