How do I take a screenshot on iPad 9th Generation

There are multiple methods to trigger a Screenshot from an iPad.

1) Physical Buttons

Take a screenshot on iPad - Apple Support

In addition to using physical buttons, you can trigger a Screenshot with a finger or Pencil using a corner-swipe gesture. You simply need to enable the feature in iPad settings.

2) Corner-swipe with a finger

Settings > Multitasking & Gestures >

• Swipe Finger from Corner - set to ON
• Bottom Left Corner > select Screenshot or Quick Note as required
• Bottom Right Corner > select Screenshot or Quick Note as required

3) Corner-swipe with a Pencil

Settings > Apple Pencil >

• Bottom Left Corner - select Screenshot or Quick Note as required
• Bottom Right Corner - select Screenshot or Quick Note as required

Try this:

Take a screenshot or screen recording on iPad - Apple Support (CA)