ESP32, where are TLS connection (WiFiSecure) CA certificate?

- Arduino board: **ESP32**

- Arduino IDE version (found in Arduino -> About Arduino menu): **1.8.13**

Although I see ESP8266 have a fingerprint in order to connect with TLS credentials, i have search all code and libraries included, but i cannot find CA certificate for ESP32 secured connection to AdafruitIO.
WiFisecure example of ESP32, has CA certificate hardcoded, but in adafruit's example (although it's working fine), there is nowhere a fingerprint or CA cert. So, how the connection is secured?

Compare the ESP32 WiFiSecure example with the Adafruit IO example mentioned in the report. Trace how the TLS connection is configured and document where the CA certificate or other verification settings come from, so the security behavior is clear to users.

Written by the indexing model from the issue text.