why is there a green box around my huawei p20 phone i cant remove

[Android Central Question]

a friend told me to go into settings on my phone and go to smart assistance,however,the phone wont even allow me to scroll down.can you help please

 

[B. Diddy]

Welcome to Android Central! If TalkBack is turned on, turn it off: https://support.google.com/accessibility/android/answer/6283677?hl=en&ref_topic=3529932