Hello @brist
We appreciate your time for writing this review. There no topics in our forums opened by you regarding the responsive issue, so we could assist you in fixing it. Please let us know more information about it so we could resolve it
Hustle’s opt-ins can be easily customized from the Design tab, it allows changing colors, different layouts, pop-up size, featured image position and fitting.
Please let us know more information about what other elements you would like to customize?
Kind regards,
Nastia