Please pass this on or repost as the dozens, perhaps hundreds, of times this question will arise on SDn
https://www.aamc.org/students/applying/amcas/faqs/305002/canschoolsseeotherschools.html
Can schools see the names of or number of other schools that I applied to?
No. Schools will never know which other schools or how many other schools you
applied to through AMCAS. In the February of each application cycle, schools will have access to the Multiple Acceptance Report, which will show them which of their accepted applicants are holding acceptances from other schools.
For example, let's say you applied to schools A, B, X, and Y. You were accepted by A and B. When the Multiple Acceptance Report becomes available, schools A and B will both see that you have been offered acceptance at the other school. You were rejected by school X, so they won't see any information about where you were accepted. No action has been taken by school Y, so they won't see any information about where you were accepted. If school Y accepts you a week later, school Y will then see that you are holding offers from A and B, and A and B will know that you now have an offer from Y as well.
In April of the application year, medical schools will have access to the National Acceptance Report, which lists every applicant with an acceptance or matriculated action.