Blender Animation Output line not saving upon exit

I’m trying to configure Blender so that it WILL NOT use the C:/tmp folder (since I prefer my C drive to contain ONLY system files, and don’t want animation files to be there) however, even though I’ve been told and have read that the location is not hardcoded, it seems whenever I save it (both setting wise) and in a .blend, it’ll revert back to the C:/tmp folder when I next load up Blender.

Is there some way to make it so that, even in new projects, it’ll always point to another folder? (in this case B:/BlendTemp)

After changing the output location and saving as the default (Ctrl+U), for me it saves this new location the next time I open blender