You will have to access the cameras OSD menu. To do so, please first try to press the + Iris button. Once in the menu you need to find either dome settings or system settings and you should find the option in there.
Please excuse my explanation as every cameras OSD menu is different, it is nearly impossible to memorize them. In a few minutes I will get one from the shelf and get you exact step by step instructions.
What proto are you using to communicate with this PTZ?
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I have made a video for you that should explain everything. I was mistaken, it was not + IRIS. Again, please excuse me every camera can be different. Here is a LINK to the video.
It worked for me, here is the direct link.
Ahh this is from the NVMS software. In order to call the OSD menu over the NVMS software you must first go to the local interface and configure Preset #95, then from the NVMS software the OSD menu will pop up when you call preset 95.
It is much easier to just do it from the local interface rather than the NVMS since this is a one time thing you need to disable.