Hi Jim,
Thank you for using Syncfusion products.
In your update, you have mentioned that you want to hide "circular color preview". Could you please confirm which one you are using by referring the below screenshot?
Currently there is no direct property to hide the circular ToolTip and Circular preview in Right side bottom corner in SfColorPicker control.
Based on your update we will update the complete details.
Regards,
Priyanga B