Hi John,
Thanks for contacting Syncfusion support.
Syncfusion has removed the design time license checking for all the Essential Studio assemblies from v13.2.0.29. So, it is not required to register the License key if you are using v13.2.0.29 or later. Please refer the following KB article link for more information.
https://www.syncfusion.com/kb/5211 You can use the License key for unlocking the Syncfusion setup alone while installation. The installation will configure the license in your machine for development. Also, it is not required to apply the key anywhere or in project.
Regards,
Manivannan S.