If your CAL licences are valid and you are changing to Core licensing, then you may not need to do anything within SQL Server.
If your core licenses are for less cores than shown in Windows, then you need to do is to set processor affinity within SQL Server for the number of core licenses you hold.
Original author: https://github.com/SQL-FineBuild/Common/wiki/ 1-click install and best practice configuration of SQL Server 2019, 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005.
When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist - Archbishop Hélder Câmara