Hi elikia,

Thanks for your patience.

1. Please edit via Elementor > Switch to Mobile Editor > and you can margin bottom to widget on mobile https://prnt.sc/5HYjJ2ZpSuEp

2. You can see recorded video for better understanding https://screenpal.com/watch/cZnI2KVdgHF

3. You can create Custom layout for subcategories then when you open category will redirects to subcategories.

Regards,