OK! We'll add the Rows checkbox to the dopesheet settings in 4.2.10-beta. Looks like:
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Note when the dopesheet and graph have their left edge aligned, like in my first screenshot in the post above, care is taken to synchronize the timelines in both views, so the keys align and both views scroll horizontally together. In that case hiding the rows doesn't gain you any horizontal space. Maybe we shouldn't align the keys unless both views have the same setting for Rows.
