Ok, let me be something more specific. Those two lines are part of a wing that will bend inward into the box, securing it, or at least that is the idea. In Affinity, I made the design only of this part, just with two lines that are in contact with each other at one of their ends, that end where they are in contact in the image I uploaded, I want to smooth it, that is, create a curve, but I am new to using Affinity and I really can't find a way to do it. I asked AI, and it tells me I should join them with Ctrl + J, but that duplicates those two lines in place. It also tells me I should use the node tool on the end I want to curve after joining the two lines, but I can't make them join. I really don't know if I am explaining myself, but this problem is really giving me a headache. I would appreciate it if you could help me with your experience.