'Contains' should be by default option selected in Filter instead of 'Choose One'
Contains could be the most commonly used option and system should allow to use this without using trackpad through shortcuts only. Cmd+Shift+F can put the filter. Then Option+DownArrow opens up filter but then there is not way to proceed with shortcut. User must have to use track pad to select the option (where I am suggesting it could be 'Contains' as default)