Sorry to hear about Kittles problems.
To use the filter in the list clik on the icon that looks like a little funnel, that will drop down some options, click in the option that says "create a temporary filter view", that will make appear a little icon that kind of looks like a small arrow right to the title of each column, click in the icon of the column you want to filter by
Dr. Lisa has an amazing recipe for home cooking if you want to this is the link https://catinfo.org/