I have a wiki pages library inside my SP on-premises 2013. And I have enabled the "Metadata Navigation and Filtering" site feature. Then i went to my pages library setting >> Metadata navigation settings >> and i added 5 site columns which are of type Managed Metadata inside the "Configure Key Filters", as follow:-
here is the result
now i am trying to find a way to define default values for these key filters. i tried setting a defualt value for these site columns, but the defualt value will be shown when creating a new page, but will not have any effect on the key filter.. so is there a way to set a defualt value for my key filters??