Change build of an app

Yes it is. You own the name, you own the app ID, so you can redesign it at your will.

You have to:

• change the code ; don't forget to increment version number and build number (must be higher than previous one ; order is lexicographic)
• create the new build and submit it
• In appstoreConnect, select the app
• Ask for a new iOS version
• Give it a new version number in Appstore
• publish the new screenshots
• explain the changes for the new version
• submit to review team

You can also add a comment to the reviewer before submitting if you want. But reviewer will probably not go and look at the older version anyway.

I had the same problem and I figured out I could not submit a new build because the previous one was still submitted for review.

So you need to ensure that your previous build is not submitted for a review yet. Then you can remove the build and upload a new one.