I see that a request have been made in 2018 to add filters to Bills and since then several discussions took place around the Bills page. It does not seem as this is a priority for the developers at Wave. We use this software daily and I'm sure that you will understand that our intention is not to make your life miserable but in fact to make our's easier. If (for now) it is not priority to add filters to the page at least add a sort function under "Payment Status". Under the Bills section you can sort on Date, Number, Vendor and Amount Due, but not on Payment Status. Since the sort function is available on the other columns, I assume it can be added to the other column as well.
Your feedback will be appreciated.