USP Pro version 3.6 and better uses Selectize to display select/dropdown fields in a more stylish, user-friendly way. Currently the Selectize script is applied only to the Category and Tag fields, but more fields may be added in future updates.
By default, USP Pro enables the Selectize script Category and Tag select fields. For example, if you add the following shortcodes to any USP Pro form:
[usp_tags include="all_include_empty"] [usp_category include="all_include_empty"]
..that will display the “Post Tag” and “Post Category” fields using the fancy Selectize styles. You don’t need to do anything else; Selectize is added automatically when using either the
[usp_category] shortcodes to display select/dropdown fields. Learn more about adding Category and Tag fields.
[usp_category]shortcodes allow only one option to be selected by the user. To change that, so users can select multiple options, add
Here are some screenshots to give you a better idea of what to look for. The first screenshot shows how the “Post Tag” and “Post Category” select fields look normally, without Selectize.
And here are screenshots that show how the Post Tag and Post Category fields look with Selectize enabled.
Note that the CSS/styles provided by Selectize are highly opinionated, in order to make the fields look all snazzy and cool. The downside is that the Selectize styles may not “gel” with your specific theme. It all depends on how the theme handles styling for form elements. SO in the event that Selectize styles don’t match well with your theme styles, or you prefer using plain/vanilla
<select> fields, you can always disable Selectize with a simple step (see next section).
var usp_disable_selectize = true;
Then save changes and done. Selectize is now disabled and your Category and Tag fields will be displayed in their default/vanilla fashion (as shown in the first screenshot above).