Add filter always showing all terms available

Hi,
I’m trying to add filters by Size and Color, my website has many of them and they can change based on new products features. Is it possible to just show all the terms instead of doing “Add All”? Otherwise we’d need to do this procedure multiple times and it’s not optimal. We need to just show all the terms available.

In addition, i tried displaying the Filters in horizontal layout but it’s shown as horizontal in the page (see attachments). Can you help me?

Thank you