Hello, can anyone assist with troubleshooting?

My MacBook Air does not automatically display on an external (LG E1942C) screen.
Cables and adaptor connected.
Mac says it doesn't have the application to run the installation drivers provided with the screen.
There does seem to be a degree of synching (wireless mouse moves across both screens), but basically my Macbook screen isn't displaying on the external.
Any suggestions much appreciated.

Thanks, I've tried changing the resolution in displays (and fiddled with colour and arrangement), but to no avail.
Oh, silly me,  just realised I had to turn on mirroring!!!

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