The Display Type parameter is applicable to the Select field. This parameter lets the users assigned “Developer” roles to define how to render the list of choices on the entry page. You can choose among the Radio button, Dropdown list, and Checkbox.
Note: These options will vary depending on how you set up the Select field.
If the Selection Type is set to Single Choice, the available options under the Display Type parameter will be the Radio button and Dropdown.
If the Selection Type is set to Multiple Choices, the available options under the Display Type parameter will be Checkbox and Dropdown.
Additional Resources: To set this property to the Select field when creating your content type via an API request, refer to the JSON payload of the Select field and the Field parameters section.
Changing an existing field property may result in loss of data. To avoid such, check out our Content Type Change Management guide before you go ahead.