Hi!
Don’t worry, I will help you out with all your queries.
1. The plugin will trigger the search request, but only if the character criteria is met. If you set it back to 0, then clicking on a filter will trigger the search.
2. Yes – but it also depends on the logic. By default de-selected categories are treated as exclusions, so if there is an overlap, then it’s excluded. I recommend playing around with the checkbox logic to see which one fits your case the best.
3. It is possible, make sure this is turned off. Usually I don’t recommend doing that as my experience is that users expect to see all results when no filters are selected.
4. Yes, by hitting the right arrow button. This may change in the future though, but right now we can’t capture tab or other buttons because of accessibility.