Changing which Google account is the default

Quick hack if you can't be bothered re-signing everything: in Gmail, Drive or Docs addresses there's a /u/0/ bit. 0 is the default account, 1 the second one you added and so on. Change it to /u/1/ and the page reloads as the other account. Bookmark those versions and you mostly stop caring which one is default.

Annoyingly Google treats whichever account you signed into first as the default, and there's no setting to change it. So: sign out of all accounts (profile picture top right > Sign out of all accounts), then sign in to personal first, then add work back with Add another account. Personal is now default. Takes two minutes but you have to re-enter both passwords and maybe 2fa, so have your phone handy. The cleaner long-term fix is a separate Chrome profile for work, then each profile only knows about one account and the problem just goes away.