Are you talking about the assistant menu? In settings > Accessibility > interaction and dexterity > assistant menu.
I've included some screen shot, you can also place the button anywhere on the screen.
You may also have the option for palm swipe to capture. You will find this in settings > advanced features > motions and gestures.
Also in the edge panel task has the screenshot button if the A9 has the edge panel. You may also find screen shot button in the quick panel. Press the little pen icon at top, see if screen shot is available to add to your quick panel buttons.
