When I touch screen to make it bigger How do I get it back to small again ?

See >>> Zoom in on the iPad screen - Apple Support

The iPad User Guide is also a rich source of information about using iPad and its many features. The Guide is available both online using a web browser (such as Safari), or as an Apple Books download:

iPad User Guide - Apple Support

https://books.apple.com/book/id1567104892

Circuitbreaker5 Said:

"When I touch screen to make it bigger How do I get it to go smaller ?"

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Deceasing Size on Touch ScreenL

Swipe your two fingers together to zoom out.