get_instance function

Hello,

I'm currently exploring the new CodeIgniter 4, like the whole new idea so i'm preppin my code into the new version 4.
Saw the form_helper is not implemented at this moment, so i've used to one from version 3 for my coding.

Then I saw the "get_instance" is not available, did this changed or is there something we need to call in order to use this?

Thanks in advance