Hi @Jose, Neethu (DE) ,
Welcome to Q&A forum!
SharePoint Server Subscription Edition (SE) is essentially the latest iteration following SharePoint 2019. Therefore, for client-side object model (CSOM) libraries, you should use the CSOM package for SharePoint 2019, as it is the most recent and compatible with SharePoint SE.
Additionally, according to my experience, you can find the appropriate CSOM package for SharePoint 2019 on NuGet with the following package name: Microsoft.SharePointOnline.CSOM.
This CSOM package will allow you to interact with SharePoint SE effectively. If you run into specific issues or need functionality that seems to be missing, it is always worthwhile to check the official Microsoft documentation or forums for any updates or additional guidance specific to SharePoint SE. Good day!
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