It is able to coolaps collapse the sequential rows. To collapse rows click on the Switch on/off collapsing main toolbar button:
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The triangle will appear near collapsed sequences. Click on the triangle to show the whole tree of the collapsed rows. Also, it is possible to control the collapsed group by a keyboard with a help of Right and Left keyboard arrows.
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<img src="/wiki/download/attachments/7438411/Collapsing Rows_1.png"/>
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