How do I change the side button functionality on HTC One M9 Android 7?

rchll

    The Android 7 update changed the power button function so that once the screen goes blank during an active phone call, pressing the power button on the side results in the call being placed on hold.  What I want is to activate the screen so I can multitask (look at my calendar, my email) while I'm talking to someone.  If I press the button a second time, the call goes off hold and the screen goes blank. How do I reset the function of the power to react the way it did prior to the update?

     

    Thanks a bunch,

    Rachelle

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