Please try to clear cache if any and try to build simple view without conditional display first as I can see you added conditional statements to your view.
I can't add conditional filters? ok, I remove them for the table header and now? I've followed your instructions and it doesn't work.
I have made a change to Relevanssi's "Keyword Matching" settings so that it searches for any word, not just the first word of the custom field.
Can you please revoke the change and use the whole word and check with Relevanssi support what changes you will have to made to make working with the changes you made.
Thank you for understanding. As per our support policy - we entertain only one question per ticket. Please kindly open a new ticket with every new question you may have.
I'm not sure what changes you made to your system and that maybe the cause as its totally broken - maybe you can start from first and try to build your search page as you did before.