Will using the eliptical machine make my thighs and butt smaller? they are more muscular so i don't want any more muscle and i use no resistance

Goals will have to be better defined as adding muscle vs desired changes in shape. Best would be to get a personal trainer involved that should help clarifying goals and having proper exercise in order to achieve your goals.

It is generally not feasible to target an anatomic area for fat loss. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health!