Conditionals based on custom fields

I’m a little confused about the way conditionals are supposed to work in Pinegrow since there isn’t much documentation on them.

  • How can I show or hide something based on the value or existence or a custom field? The get_post_meta conditions seems to be a step in the right direction, but it only lets me use true/false conditions.
  • What is the purpose of the “else” conditional. I can’t seem to get it to do anything.
  • What would be the right way of writing a condition that says "if the value of ‘custom_title’ is null then use ‘the_title()’?