I'm using Google Earth Pro, release 7.3.2.5491 (64-bit). There are various versions, not sure which you are using. You may have changed, and that may be why you can't see the button.
I select the Ruler (measurement) button from the toolbar (looks like a ruler). If you don't have the toolbar turned on in View, go to Tools, Ruler and turn it on there.
I also use Google Maps (right click for measurement, as noted above).
Then there is Google My Maps (maps saved on Google Drive, some more advanced features such as support for multiple layers) and that doesn't support right click. There is a toolbar button in that application showing a ruler for Measurement.
PM me if you like
Jeff
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