How i can remove Working Functionality of my header & footer plugin from backend files but in front end plugin need to show that plugin activate

I have a question actually I have a website in which one of my friends is using too many scripts in the header & footer using header & footer plugin in WordPress so I just want to stop the functionality of plugin from backend files but I want to show plugin works perfectly on the front but stop from the back end is there any way to do this please help…
Thanks.