Great ideas! I immediately started working on them when I saw your reply.
So right now the nodes boxes can be minimized to get rid of color selections and notes too if you cycle through the three choices. I have added a settings button at the top containing a toggle for color key to display or not, which can be moved around or be closed- just like the nodes. I have put a lock toggle within the settings drop down that removes the buttons on all nodes and color key and slightly enlarges the text without changing the node size.
There is also a high contrast toggle that turns the canvas and nodes white, with a colored outline followed by a black outline.
I have also added a save screenshot which automatically changes to high contrast (to later print with minimal color) and removes buttons. Print formatting would be a bit larger problem to deal with on desktop and may not fit on one page. Also, print isnt even an option on android mobile devices so the save printable screenshot is the best workaround i have for that.
I've also created a toggle to turn snap-to node alignment on and off which will only affect nodes that are placed after the choice is made. This way it doesnt mess up node placements thet users may have been happy with already and didnt want moved. Just a small detail that may not matter, i suspect most users would be happy with the snap-to just always being on. It's not super aggressive in its placement right now and just helps things look a little more organized.
I'll sit on this for a day and make sure everything is working well in actual use. If you have any more suggestions let me know, otherwise i'll just update the file tomorrow.
Thank you for the feedback! I genuinely appreciate comments like yours that can help me make the best functioning app for puzzle sequencing while still keeping it intuitive and easy to use.