Can't hide cells in a table

I am using a table to design the questions and answers on my form.I have a row with four cells and I'd like to have cell 1 be a question to answer with Yes/No radio buttons in cell 2. Then I would like to have cells 3 and 4 be another question and answer fields depending on how the radio buttons are selected. If the answer to the first question is Yes, then the content of cells 3 and 4 should be made visible.

I've gotten this to work previously, however, in this table, the Hide (exclude from layout) option in the Presence subsection is grayed out. Can anyone help me know why the option is grayed out?

Thanks,

MDawn