This forum is entirely dedicated to Fiddler Everywhere so that said FIddler Everywhere will support TLS 1.3 in a future release. That will most likely happen when an official version of Windows 11 is released (as currently Microsoft are not planning on supporting TLS 1.3 in Windows 10) https://docs.microsoft.com/en-us/windows/win32/secauthn/protocols-in-tls-ssl--schannel-ssp- ) .
For requesting and discussing possible Fiddler Classic features please use the Fiddler feedback portal.
About two years have passed since: https://www.telerik.com/forums/decrypting-tls-1-3
It looks like .NET supports TLS1.3 as of now. At least on Windows 11 TLS1.3 is enabled out of the box. Will Fiddler Classic support TLS 1.3 ? Will it get new features in general or is Fiddler Everywhere where most of development happens nowadays?