Every time I update the table of contents field in my documents, the whole
field turns blue. How do I stop this?

I have seen other instances where Word seems to assume that I want the color
of text to change for some reason (i.e. after forwarding an email, any new
text I enter is a navy color). Is there a way to change this, as it wastes
time when I have to constantly fix it.

Thank you for your help!