Answer, Mute, & Reject Calls Without Leaving the Current App You're In on android 7?!

Hello how can I Answer, Mute, & Reject Calls Without Ever Leaving the Current App You're In on android 7..on my old galaxy s6 with android 6.0.1 i could answer and the call would remain in the same little box up in the screen, now in the new s7 with android 7 why i answer a call always get me out of the games and apps i was running to show the main call screen! Help please!

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