You can use the Shortcode using the Combo Blocks Plugin. This article will help you to use the Shortcode.
To begin, insert a “Shortcode” block.
Click on the Shortcode Key tab.
Here you can select a predefined shortcode of some popular plugins or paste the Shortcode of your own generated Shortcode.
Predefined Shortcode:
Click on the Choose Button to select the Shortcode of some popular plugins.
Generated Shortcode:
Here you can paste or enter a Shortcode.
Now, you can find the preview in the editor section.