With the current version, what you want to do is not possible (have two forms that work together to filter the same posts listing on the same page as the filters).
#4. I am sorry, no. In V3 (due soon), we will make it possible to separate the fields of a form to place them where you want on the page, so, you would be able to split the form into two parts (or even more). I think that would meet your needs.
#1. Only some custom JavaScript will do as you want with the current version of the plugin, but, again, V3 should bring the option you want (to hide the field title when there are no terms to show).
#2. Some custom CSS will be needed, to set the options to display: inline-block, and also to have some margin between them (probably margin-right). See also #3:
.searchandfilter[data-sf-form-id="2325"] .sf-field-taxonomy-portfolio_category li {
display: inline-block;
margin-right: 15px;
}
#3. Either use custom CSS to hide the first option, or switch to checkboxes (which do not have the ‘all’ option). The problem with hiding the first option on a radio button list is that, after you have made a selection, you cannot deselect it without selecting another option (i.e. cannot have none selected). My advice would be to switch to checkboxes.
#5. I am not sure what you mean? Do you mean to make the text labels be the filters, like a tag cloud? If so, that is possible with some custom CSS, where the checkbox or radio button is hidden and the selected term highlights in some way when selected (text color or background color).
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