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Hi, this isCustomerand I will be helping you with your issue today.
I understand that you have some questions regarding your iPad, I will be glad to answer them for you.
To answer your First question,
Swipe up from the bottom to get your iPad screen and you will get the control center, In control center there will be an icon with an Orientation lock, When you enable that you get to lock the rotate the display, unlock it an to rotate the display.
For your second question Please open Settings > Display and Brightness > Auto-Lock > and increase the time to your desired time to increase the Standby time.
You are most welcome,