It is the default setting in the 'Drawing' tool.
Just like any other tool, it will remember the default settings.
If you draw a red line, select it and change it to blue, then draw a new line it will be red - not blue, as the tool default is still red.
You only changed the setting for a line instance - not the default for the tool.
So, either set the default in the tool before you draw the line (or place the drawing) or ALT+click on the line (or drawing) to set the default properties of the tool to the same as those for the placed instance.
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11