I made a player customization menu for the player to shape the character the way they want, but when changing the scene, the configuration that the player made simply changes, no changes appear. What can be done?
Debugging.
You are obviously expecting the data to persist someplace until you need it in the next scene.
Usually this is accomplished by a GameManager construct. There are ten billion youtube tutorials that describe this construct FAR better than I could ever do in this little box.
I would start by investigating that area of the code.
By debugging you can find out exactly what your program is doing so you can fix it.
Use the above techniques to get the information you need in order to reason about what the problem is.
You can also use Debug.Log() to find out if any of your code is even running. Don’t assume it is.
Once you understand what the problem is, you may begin to reason about a solution to the problem.