Space for Chord Diagrams at top of page

Chord diagrams appear correctly at the top of the first page, but there’s too much space (enough for two rows of diagrams) above the first music staff. How do I grab the blue line at the bottom of the chord diagram section and move it up so it’s just below the chord diagrams?
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I have not tried it but maybe this setting in layout options will do what you want.

That did it, thank you. There were originally two rows of chord diagrams; when I increased the number of diagrams per row, all the diagrams then fit in one row, but the enclosing vertical space did not decrease. I reduced the vertical space from 60 mm. to 20 mm.