Check out this post and read it to the end, you should find some things that can help you, including a function that allows you to create a red layer if it doesn't exist and add an annotation to it.
Normally default is checked when you put a color on a layer. He is the one who is driving, you have to uncheck to be able to put another color in the same layer.
This is set in the file template, but normally the default is checked when creating a layer (visible only by placing a note or a line and selecting the "line color" tool), the color of the lines/notes is set by default by the color of the layer.
If someone has unchecked for a particular note, it doesn't disable for the rest of the layer.
If nothing is selected, this tool displays a default setting of SW that I know of, but which is not related to the layer setting.
Edit: Regardless of the version of SW it seems to me that it has been working this way since at least 2003/2004. I'm on SW2019