Hey @gabriellimf. To change your seam allowance all you need to do is take note of the nodes that connect the lines you wish to change and then alter in the “individual seam allowance” form, marked out in attached pic.
Things to note are that nodes will maintain the universal seam allowance (‘default’). And ‘before’ form effects the line that comes before the node in a clockwise direction, and ‘after’ is the line proceeding it.
To help illustrate I have attached an example…
I want to remove all seam allowance from armhole. To do so I have selected node ‘A13’ first and then, because i wish to maintain seam allowance at shoulder length (Line_A7_A13) at 1cm, I leave ‘before’ at 1cm. In ‘after’ I enter 0. For node A11 both lines before and after will need to be changed to 0cm - as pictured. And then I would go onto select A14 node where I would change ‘before’ to 0 and leave after at ‘default’ (or ‘universal seam allowance’).
Hope this helps.