[Block] Heading
Select the contact form option from the theme editor.
Click on Add block. Select Heading from Theme Block dropdown.
Setting
Description
Heading
Add text to display as a block heading (Leave the field blank to hide the heading)
Show separator line
Displays a line to visually separate this block from the other blocks
Block padding
Setting
Description
Top margin
Determines the height of the top outside space of the section. Can be from 0px to 100px, increasing arithmetically of 1px (pixel).
Bottom margin
Determines the height of the bottom outside space of the section. Can be from 0px to 100px, increasing arithmetically of 1px (pixel).