How do you delete unwanted contacts
See if this helps:
Delete a Contact - Samsung Galaxy S7 / S7 edge | Verizon Wireless
On top of what tikibar1 noted already, when you are accessing your contact list if you long-press the first contact you wish to remove then to the left of all the contacts check boxes (circles, actually) will appear. You can then select multiple contacts at once by checking off the circles. Up on the top right of your screen will be an option to share or delete. Make sure you only select the contacts that you really wish to remove before hitting the delete button! As always, make a backup of your contact list before doing something like this just in case a mistake is made. :smileyhappy: