Epson Z8250NL - Manual (Page 49)

Security Functions
49
B
Select "On".
The buttons related to the lens operation are locked according to
the setting you chose.
Remote control button lock
This function locks the following buttons on the remote control.
Procedure
Each time the [Help] button is pressed for at least 5 seconds, the remote
control button lock turns on or off.
Remote Control
Remote Control