Can you fully power down the Android tablet remote screen?

Is there a way to turn the tablet off ? I can use the power button to turn off the display, but i cannot find a menu option anywhere to fully power down. Just wanting to save power when i am away from the boat for long periods of time.

Long press of the power button gives an option to power-off or restart on my device.
This is most likely device specific.
Also note that some devices allow configuration of the “power button” in settings.

Try to press the volume and the power button at the same time for some time and the device should turn off completely. Works with my Lenovo Tab M9. The power button alone only turns off the display.