I accidentally discovered that if I highlight text, then un-highlight it, a record remains in the table that has neither a note nor a highlight flag.
How to reproduce this:
1. Click and drag in a Bible verse to select some text.
2. You will see the highlight dialog popup.
3. Select a highlight color.
4. Click somewhere else to see the colored highlight.
5. Now click and drag the same text that is highlighteded.
6. You will see the highlight dialog again.
7. This time click the undo icon (circle with backslash through it.) to make the highlight disappear.
8: In the main menu, choose Tools | Notes to open a Notes panel.
9. In that panel, if you don't see the filter icon (triangle with a dot under it), click the hamburger icon until it appears.
10. Set the filter to Type | Highlights and choose "by date modified" to put your latest addition at the top.
11. At the top of this record, you will see the record that has a null (circle with backslash) for both Note and Highlight. It's taking up wasted space.
12. Delete the record by choosing the menu (three vertical bullets) and choosing "Delete this record."
By now I might have a thousand of these bogus records to delete.
Q: Is there a way to filter them out of the rest to speed the process?