Idea Summary
Allow me to change app icon at any time with same simple UX that's allowed during create time.

Use Case
When creating my donor-tracking app in APEX, I took the defaults initially and ended up with an app icon that was a stubby rocket ship. When I was ready to release the app to my users, I wanted to change the icon to something more appropriate. I was happy to pick one of the choices from the
icon gallery that appears in the "Appearance" section of the new app wizard, but struggled to find where to popup the icon gallery picker again after my app was already created. I later confirmed that it wasn't possible to do through an icon picker dialog, but that changing the icon required thinking to look in Shared Components > Static Application Files and replacing the app-icon.svg file by uploading a new one of the same name. This isn't something a low-code user would think to do.

Preferred Solution
In application settings, provide a (Choose Icon) button that pops up the same easy to use dialog that appears in the “Appearance” section of the new app wizard.