It is able to collapse the sequential rows. To collapse rows click on the  Switch on/off collapsing main toolbar button:

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     <img src="/wiki/download/attachments/7438411/Collapsing Rows.png"/>
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</center>

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.

<center>
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     <img src="/wiki/download/attachments/7438411/Collapsing Rows_1.png"/>
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</center>

To update the collapsed groups click on the corresponding main toolbar button.