To change the default account, click 'account setting' pane, then highlight the desired new default account on left side of pane, scroll down slightly to "Account Actions' menu and click to make the account the default.

You explained it so understandable in just a few words, what people and support out there weren't able to in sentence after sentence. Thanks, David.

You are very welcome. And thanks for the kind words. I was glad to assist.

I've been looking for this <default> for years. It took me awhile even with your instructions to decipher this "pop up" list of Actions. That downward facing chevron doesn't expand/collapse the list group below (as usual) - it opens a temporary pop up list above! Crazy UI decision. Thank you for pointing me to the right spot!