Sorry I didn’t get back to you sooner I was out of town for a couple of day!
Annotations are for whatever date range you set them to. They can be just one day to explain the workout you did or span across an entire week to show you are on vacation. It depends what you set it to when creating the annotation. If you only want annotations to be on one day, make sure the start and stop date is the same. Below is an example. Test-1 spans 2 days, Test-2 is a single day, and Test-3 is 10 days long and will continue onto the next week.
If I’m misunderstanding your question, would you mind explaining a bit more and maybe posting a screenshot of what you are seeing?