SSMS 20 is the first version to support TDS 8.0 and TLS 1.3 , thanks to the migration to the newer Microsoft.Data.SqlClient (MDS) driver.
Starting with version 20, Microsoft no longer bundles ADS with the SSMS installer. This allows for a cleaner installation for those who only need the core SSMS experience. sql management studio 20 download
Version 20 introduces stricter default encryption settings. You'll notice new "Encryption" and "Trust Server Certificate" options in the login dialog. SSMS 20 is the first version to support TDS 8
Unlike incremental updates, version 20 brings architectural shifts focused on security and modern driver support. sql management studio 20 download