How to hide submit button?

I would like to release our form with a disabled or hidden submit button, so that people can check it out and consider their options.

That doesn't seem to be possible? I can't even do a show/hide using a conditions statement.

Do I have to remove it?

Add a Section Collapse element and hide it using your condition.

Here's a sample screencast:

Let us know if you have any questions or if you need further assistance.