How to turn of the shutter sound of the camera on my tablet?

I have a lenovo android tablet and I can't find a way to turn the shutter sound off. I've tried turning the volume of the device all the way down and the shutter still makes a noise. I've checked all the menus in the settings and can't fine any option on turning the sound off and I've checked the settings while in the camera as well.
I really need help because I want to take photos while I'm at uni and as of the library to help me with my work and don't want to distract those around me. Amy help will be highly appreciated and thank you all in advance.

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