You can change your choice at any time, per category, via Cookie settings at the bottom of every page. Withdrawing is as easy as giving consent.
If you switch a category off, we immediately delete the cookies and stored values of that category and reload the page, so those services stop straight away. After that, Google keeps receiving the cookieless reports described above, as it does for everyone who does not give consent.
Two things we cannot prevent. The IDE cookie lives on Google’s own domain; we cannot delete it, you can only remove it in your browser settings (under Privacy or Cookies). And right after you withdraw, Google may still receive one measurement from the page you were viewing, collected before you withdrew.