Blocking Remote Access?

I m currently second in command of my church s A/V sector, specializing in running the sound board. It s a new Behringer X-32 digital desk, and I couldn t complain.
Except… The gentlemen who trained me, although a great guy is scared of failure, and multiple times a service will remotely access the board with his tablet via an app, and hijack the controls. Not only is this disrespectful but totally throws me off. I know the board well enough, and the changes he makes are totally subjective with no real need for them.
If I was blatantly botching something it would make sense, but his reasoning for slaving the console to his iPad are just absurd at times and reeks of perfectionism.
Is there any way to lock out a wireless device and avoid this? I ve tried reasoning with him multiple times to no avail.
Help?

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