Go to Salesforce "Setup"
Search for "Custom Settings" > Click on "Manage" next to "SalesWings Options"

3. Click "Del" next to the custom settings of the non-admin user who set custom settings

Go to Salesforce "Setup"
Search for "Custom Settings" > Click on "Manage" next to "SalesWings Options"
3. Click "Del" next to the custom settings of the non-admin user who set custom settings