Extra Product Options provide Select2 styling as default. If you want to display select fields in your default style or the style provided by the theme, you can disable Select2 by checking the Disable “Enhanced Select(Select2)” for the select fields check box.
By not Disabling “Enhanced Select(Select 2)” for select fields
By Disabling “Enhanced Select(Select 2)” for select fields
By enabling “ Disable “Enhanced Select(Select 2)” for select fields”, there are mainly two changes you can see. The first visible change is the design change and the next is that you can search for the select field rather than the legacy select field.