In your Zoom meeting, tap the screen to reveal the Zoom controls. Then tap the green Share Content button.
From the dropdown menu, select screen or any other content from your iPad you wish to share.
If you have never done this before, the window that pops up will be titled Screen Recording. Scroll down through the apps until you see Zoom and tap on it. Then the title should be Screen Broadcast. Tap on Start Broadcast. You can choose to have the microphone on or off.
You will then see a Broadcasting screen. Tap the home button to access the content and apps you wish to share. Your screen during broadcast is not automatically recorded even though the message says it will be. You can return to this screen to start or stop the mic and end the broadcast by double tapping the home button and selecting Zoom.
While you are on another app, you will not see the Zoom meeting. Participants in the Zoom meeting will see your screen pinned and a video off instance of your iPad's Zoom session.
To end your screen share, you may tap on the small broadcast icon in the upper right of your screen or return to the Zoom app and tap on the end broadcast button. In the Zoom app, tap on the broadcast window to make it disappear in order to see the Zoom meeting participants again.