If you don't need to notify a contact of your visitors' arrival or are looking for a modern version of a sign in sheet only, we can do that!
Start on the buttons page of your online dashboard. Select ' Existing Buttons' on the right then click to edit your sign in button. Scroll down the to the 'Select Employee Contacts' section. The last option on the right will 'disable contact selection' and set your button to simple sign-in only behavior. Enable that feature and save at the very bottom: