If the CollecTin More tablet starts talking to you, and adding green boarders around sections you tap an Accessibility feature called "TalkBack" has been activated.
A combination of very long volume button presses can bring up the below window, which provides an option of activating a shortcut to TalkBack. Someone will have turned it on by accident at some point.

Once "TURN ON" is selected, a shortcut is created which enables you to activate and deactivate the "TalkBack" feature by holding down both volume keys for a few seconds.
Step 1 - Temporarily disable Talkback to gain access to your settings
> Hold down both volume keys for a few seconds until a message appears that confirms TalkBack is turned off
Step 2 - If your Fully Single App Kiosk is activated, please stop this by performing the 7 fast taps and entering your pin.
> Stop Kiosk Mode
Step 3 - Completely switch off and deactivate TalkBack
On your Home screen go to
> Settings Cogwheel on your Home Screen
> Accessibility
> Select to Speak > Toggle OFF
> navigate back via the back triangle on the bottom left
> TalkBack > Use TalkBack > Toggle OFF
> TalkBack shortcut > Toggle OFF
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