Unable to change required field for Targets through studio

I am unable to change the last_name to a non-required field. I have gone through Admin>Studio>Targets and then unchecked the required field box for last_name. It is currently reflecting that when I pull it up in the studio; however the Last Name still has an asterisk next to it when I try to create a target. I haven’t found anything besides the steps I have currently taken to rectify the issue.

I have been able to change the required field for leads but I have not been able to for targets (we do not always know the name of the person of contact when we target a business) In order for the required field to change I had to also change Importable from ‘Required’ to ‘Yes’

Please help