Canon EOS 90D Advanced User's Manual page 466

Connecting to a Wireless Remote Control
Canceling the Pairing
Before pairing with a diff erent BR-E1, clear the information about the
connected remote control.
466
1
Select [k: Wi-Fi/Bluetooth
connection].
2
Select [KConnect to Wireless
Remote].
3
Select [Delete connection
information].
4
Select [OK].