Is your feature request related to a problem? Please describe.
When checking sessions data in UI, especially when investigating some special bug, you need to select a single specific filtering value. To achieve that you must deselect all existing values in the filter's dropdown and then select requited one

Describe the solution you'd like
Quick way to for this is to have "None" button in filter's dropdown that would deselect all existing values. After that user can select necessary value from the list or using list filtering within the dropdown