Which element on your pages causes the most layout shift, and how did you fix it?

web.dev says each layout shift score is the impact fraction multiplied by the distance fraction, and that sites should aim for a CLS score of 0.1 or less at the 75th percentile of page loads.
https://web.dev/articles/cls
The full answer on what CLS is and how to fix it is on the blog:
https://aiwebpageseo.com/blog/what-is-cls-how-to-fix-cumulative-layout-shift
What was behind the worst layout shift you have tracked down, and what solved it?