What kind of LLC do you have? You might need to amend 2018 and take off the K-1 and fill out schedule C for your LLC. Unless you have a Single Member LLC and selected to be an S corp. Then you have to file a 1120 S business return, then you will get a K-1 or W2 from the 1120 S. That is a whole other situation and you will need help.
If you have a SMLLC that is not an S corp it is a disregarded entity and you file it on Schedule C.
Try deleting it this way. Go to the K-1 interview section here
Federal on the left
Wages and Income
Then scroll way down to Business Items (or S-Corps, Partnerships, Trusts)
Schedule K-1 - Click the Start or Revisit button
If the first screen says "Do you want to review Schedule K-1?". You have to answer yes and then click Update by the Schedule K-1 type (LLC, S corp, trust). The next screen is the Summary screen listing all of the K-1 entered for that type of entity. You can review, edit or delete it there.
