Caldera Forms Styler module allows you to design your form beautifully. If you are not able to see this module in the UABB’s module list please check the following things –

1. If the Ultimate Addons for Beaver Builder (UABB) plugin is updated to v1.30.4 and above. This version will deprecate the Caldera Form Styler module. As per the official statement from Caldera Forms, the plugin will be retired on 31 Dec 2021. So Caldera Form Styler module won’t be available for new users after UABB v1.30.4 
2. Caldera Forms plugin is installed and activated. Caldera Forms Styler widget totally depends on the Caldera Forms plugin and will not be available unless the Caldera Forms plugin is installed and activated.
3. Caldera Form Styler widget is activated from Dashboard > Settings > UABB > Modules and also from the Beaver Builder Modules list.