You can customise the Power button, controlling what happens when you press it twice and when you press and hold it. You can also choose what happens when you slide up or down on the Power button.
Choose what you want the gesture to do:
To start voice command with , select Digital assistant.
If you select a choice other than Power menu, then to see the Power menu for turning off and restarting, you'll need to press the Power + Volume up buttons simultaneously.

You can set the power button to open and close quick settings and notifications when you slide your finger up or down it, or set it to zoom in and out on Google Maps.
To use the gesture:

Set what you want the gesture to do:
To zoom in/out in Maps when you slide up/down, select Zooming.
Move Slide sensitivity to adjust how firmly you need to press when sliding to zoom.
To disable the gesture:
