1. You need to install Child Theme for Listivo
2. Open functions.php via some code editor (I use VS Code) and paste this code:
3. After that go to Wp-Admin > Listivo Panel > Custom fields and take ID for text field:
In my case it's "5728" and the next change at this line:
4. If you want customize this button for example show the value of this file you can use this code:
It is enough to replace one code with another. This example shows that the phone number entered into our text field is a button that automatically opens the connection options.
5. Edit single listing template via elementor and find this widget:
After that put into place you want display this button: