How to change app appearence?

I noticed that there is a difference between the old app settings and the new app settings for the appearance section.

This is how the interphase used to look like:

And this is how it looks like now

Can anyone tell me how do I bring back the old interphase?

after digging into some research I noticed that the one that I used to operate on is the classic app , how do I resume back to use the classic app? Is it block behind a paywall by any chance?

I wouldn’t bother with Classic Apps. Classic means old and expired. They will eventually go away.

If you were grandfathered in, I believe you can still create Classic Apps, and you can still modify existing Classic Apps, but they are being phased out and do not receive updates or support.

Stick with New Apps.