Heading Field

This field creates a heading for the form that can’t be changed by the users. Actually, it only names the different parts of the form. However, it is a form field, not a standard WP block, and you can set visibility rules for it.
Settings

Style Settings

If you have installed the JetStyleManager plugin, the Block Style button will appear in the top right corner of the editing window. Here are the styling settings you can meet there: