How to change the slot depth to 2.6 millimeters?

I downloaded a file from etsy and it has a ton of tabs and slots that are designed for 3mm wood. I have 2.6 mm wood and have changed the slot width for all pieces except the sides. In the screen shot the slot depth circled is 3MM and I need them to be 2.6MM. Is there a way to simply manually change the length to 2.6mm? I have already gone into node editing mode and do not see extra segments. The lines are all solid if that makes sense.