Modifying lines in an SVG file

Purchased an SVG file from Etsy but need to modify part of one of the layers. I can’t ungroup any more but need to deepen the notches in the outside edge so it’s flush when I put on the sides. Is there any way to do this? I’m new to some of the more complex features in Lightburn so I won’t be surprised if there is no answer or conversely there is a simple answer right under my nose.

The highlighted lines I need to deepen so the thickness of the side material will sit flush.

If you’ve ungrouped fully you should be able to use the node edit tool to move the location of the nodes that define the shape. Pay particular attention to the tooltip on key commands that are available while using the tool.

Thank you! I knew someone would have the answer. Appreciate you!