This trick is in relation to polls. You can have a poll with 1 or 0 choices, instead of the minimal number of 2 choices.

When creating a poll, put your option label in the Option 1 box and in the Option 2 box, enter one space. If you want to remove both options, enter one space in the two first option boxes (Option 1 and Option 2).

There is also a way to make the question empty, however I will share it later.