In some cases, all the available options are presented on the screen, but some of them are too small, and a scroll bar is added.
Example: If you open the Text module → Dynamic Content option → Choose Post Link, the Dynamic Content modal window will have a scroll bar to indicate that more options are available.
To eliminate the scroll bar and to increase the height of the modal window, follow these steps:
Go to the Divi → Theme Options → General Tab → Custom CSS
Add the following CSS snippet:
/* Remove unwanted scroll bar in Divi modals */
.et-fb-field-settings-modal {
max-height: 500px !important;
}
The result can be seen in the screenshot below: