How to remove InfoPath form from a List Library after transferring it to SharePoint Online

[WorkHard]

I have the following challenge.

We are moving a list library from Sharepoint 2013 to Sharepoint Online.

This list has over 200 items and is very difficult to write from scratch. 

What I did was:

1. Saved the list as a template (without the data).

2. Created an "app" with that template in Sharepoint Online.

3. Imported the data using a third-party tool.

I know InfoPath is not supported in Sharepoint Online so my plan was to recreate the form using Power Apps but the option is missing.

I'm getting this message:

How do I remove any reference to InfoPath and recreate the form in the new Sharepoint experience? The option is missing.

Thank you!

[#2]

I'm also stuck here. The migration moved the form, but the only option is infopath. Even OOB form not an option. Irritating, because I created an app for the list, but on the back end it seems tied to infopath, still. Search function seems to be affected.