What year is 10.1 samsung galaxy tablet model ce0168?

Try holding power button and volume up button same time

https://www.ifixit.com/Guide/Samsung+Galaxy+Tab+3+Password+Lock+-+Hard+Reset/24444

this
https://www.amazon.com/Samsung-Galaxy-Cable-Charging-ECC1DP0UBEGSTA/dp/B004DBD4TG

it is possible if screen rotation is turned on in settings > display or from the notification shade

Hold down the stop button for several seconds or do the same with the start button

Try holding down the power button for 5-10 seconds and see if you get a power-down dialog box. Look for a hard reset switch (usually small hole with metal at the bottom) on the back or sides of the case and poke it gently with a toothpick. Check your manual for a hard reset procedure if neither of these work.

CE0168 is not the model number, it is just a reference for devices. Your model number should start with SCH-. It is located under where you see CE0168 and should be next to "Model:" or "Samsung Model:".

Go to the Samsung site and search for it.

You can grab one here: http://www.yunopdf.com/samsung-ce0168-manual/

It's not that complicate to use, most people don't know that it's the regular Galaxy tab, just a different model name.