In Engrave mode, each octave line has three square handles. You can use these handles to move the start/end of octave lines graphically, and to lengthen/shorten octave line hooks.
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The start handle moves the start of octave lines graphically. You can move this handle to the right/left. When using the keyboard, you can also move this handle upwards/downwards to move the whole octave line.
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The top end handle moves the end of octave lines graphically. You can move this handle to the right/left.
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The bottom end handle changes the length of the hook. You can move this handle upwards/downwards.
If octave lines cross system and frame breaks, you can move the line segments on each side of the break independently.