Is it possible to remove or disable the ionic 4 shadow dom?

I upgraded my project from ionic 3 to ionic 4 and it’s design crashed at all, and I think it’s because of the “shadow dom”. How can I fix this problem? Can I disable or remove shadow dom?

Can I disable or remove shadow dom <— no

I suggest u done the upgrade page by page as many dom object name and attribute change from v3 to v4.