Hello, @andrewhawk,
If you choose the “OR” condition then you will be allowed to search multiple colors from the filters see the image: https://postimg.cc/SXCBdwvZ and https://postimg.cc/pmn4VwR2 but with the “AND” condition you can only search 1 color at a time. In simple words “AND” condition only works for 1 thing and the “OR” condition works for multiple things. This is how it works and you cannot change it without customization.
Regards 8Themes Team.