You have to be careful with chaining majors once accepted, but it can be a good plan if used correctly. Make sure the major you want to change to is in the same academic college as the one you get in as. This varies by school so do some digging.
For example: Say you apply to XYZ University as an English major, but you want to change to Chemistry. Both are in the College of Arts/Sciences, you just fill out a form and that’s it. Major changed. However, if you were to switch from English to Engineering, you would be going from the College of Arts and Sciences to the College of Engineering which might mean you have to basically apply again.
Bottom line is it’s tricky and varies a lot by school.