filtering not working via gateway or router

I have set up the router to point the DNS…. in my dashboard i blocked gaming/adult contents….tested from my windows laptop…..i am still able to browse the online gaming site……if only if i install desktop app in my pc it works…..the whole idea i signed up for clean browsing ….so that any member of my family or guest when they will be connected via wifi……they will not be able to browse adult contents or something which i customize in category selection….Its not feasible from me to install app in each device as it get signed in …….
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