How to create custom views on custom module in version 8

Does anyone know how to create custom views on custom modules in version 8?
Because doesn’t work any js files or php views

Hi, I am also interested in edit views and customizations but it seems with version 8 is quite different than previous versions.

With all my respects, it looks like they have put a layer on top to lock customizations, code looks the same but locked, it seems you have to re-build everything again.

It is a shame, if I am wrong, please aswer how to customize the software in a open way like before.