From [Gravity Forms: Embedding A Form](https://docs.gravityforms.com/embedding-a-form/#function-call):
`gravity_form( $id_or_title, $display_title = true, $display_description = true, $display_inactive = false, $field_values = null, $ajax = false, $tabindex, $echo = true );`
So instead of stopping with
`{{ function('gravity_form', 1, false, false, false, '', false ) }}`, I needed to carry on all the way to the last argument, with `('gravity_form', 1, false, true, false, '', false, false, false)`. Holy crap.