In a Next.js sandbox, adding a _app.js file to the pages directory to override/extend the default is not being detected by the sandbox. _app.js is not being included in the next.js build / dev process.
I'm trying to experiment with persisting / manipulating components between page changes by adding layout and header components to _app.js
| Software | Name/Version |
| ---------------- | ------------ |
| 小odesandbox | PROD-1571674162-0e9c0cfe9
| Browser | Chrome 77.0.3865.120 (Official Build) (64-bit)
| Operating System | Mac OS Catalina 10.15
Hey @eckmLJE ,
Did you get this to work in the meanwhile? It seems to be working now:

I can guess what happened here.
When you add _app.js, you have to restart nextjs (as far as I know, it doesn't restart itself on _app.js creation)
On CodeSandbox, you can restart the server from the Server tab on the left.

I tested this scenario and it works well 馃憤
If it doesn't work for you or if there is any additional context you'd like to add, feel free to reply here and we'll re-open this issue.
Most helpful comment
I can guess what happened here.
When you add
_app.js, you have to restart nextjs (as far as I know, it doesn't restart itself on_app.jscreation)On CodeSandbox, you can restart the server from the Server tab on the left.
I tested this scenario and it works well 馃憤