I decided to update the project to next.js 14 and immediately the errors came up. He can't find the page and unknown errors, with that, I removed everything from the page and still he gives me an error in the console, despite the fact that I will even lift page.tsx up

Isn’t this because your page in a folder with brackets () meaning its ignored for the route of the page? So if you think the folder with brackets away, i think your page.tsx will be on the same level as your main app/page.tsx file

why does it then work in version 13.5.6? Or another question. How do I make different layout?