Hi, can you tell me your Bootstrap settings in Toolset > Settings > General?
Which styles you want to remove or override? Some of the styles are coming from your theme, so I'm not clear which styles you want to keep and which styles you want to remove. Please be very specific and describe the styles you would like to remove.
Okay I am visually comparing the differences and the only difference I notice is the overall width of the select element - am I correct? Here are a couple of ways to adjust the overall width.
1. To set a specific pixel width, add the following CSS to Layouts CSS & JS:
You may adjust the width value by changing the 200 to whatever pixel width you feel is appropriate. This will modify the width of the demo4 container, and the select fields will adjust automatically to fill the space.
2. To specify a responsive width, use the Bootstrap grid system to apply a responsive width class or classes to a wrapper div inside the wpv-filter-controls tags in the Filter Editor section: