I know this has been asked before, because I tried a search forst before posting, but I have done as suggested, and it seems not to have worked.
At the moment, if I change the formatting for a word, the whole document is changed to that new formatting. This is a real pain in the butt.
Looking through previous searches, I see that I should look at Tools, templates, and change the setting there. I've done this, but it still happens.
It looks as if there are individual settings on each Style, which force an update.