how to mirror Ipad pro to mac air laptop

iPad doesn’t support mirroring to a Mac or PC, but recent Mac computers with MacOS Catalina can use iPad as an extended display using Sidecar:

https://support.apple.com/en-gb/HT210380#systemrequirements

An alternative to Sidecar is Duet - but again this provides an extended desktop from Mac to iPad:

https://www.duetdisplay.com/