I've found that if I use the selection tool, not the chord tool, I can select the chord and delete it. 

Is this the only way to do it? It would be easier to stay in chord tool, and the online manual does say I can delete chords with the chord tool.

Indeed you can delete chord symbols while being in the Chord Tool.

When you are in the Chord Tool, there is a handle on each chord symbol.

You can drag-select across multiple handles, to select several chord symbols at the same time.

When the handles are selected, you can delete the chord symbols, by hitting the Delete key.

You can also use the context menu, but the Delete key is faster.

Thank you Peter!  I didn't even see the handles - need new glasses.  They're small, but I'll practice working with them.

You can enlarge the handles in Preferences > View

Thanks Mike, that's a big help.  I'm trying to decide whether it's better for me to go with larger handles, or just uncheck the Transparent Handles box.  I'll have to see how it looks with other items that have handles.

PS I see yours are set at 8 pixels, even smaller than mine which were 9 pixels.  Maybe the default it different for Mac.

That’s possible.Anyhow, I hope it helps you.