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EAP methods allows to set 'tls_min_version',
which is 1.0 by default

WebGUI dropdown option needed to select between TLS 1.0/1.1/1.2

What about TLS 1.3, see 3.0.20 release notes on https://freeradius.org/release_notes/:

Note that tls_min_version/tls_max_version also support "1.3" 
Since there is no standard yet for EAP with TLS 1.3, it will not work.