Thanks for your post.
If I understand you correctly, you’d like your products that appear as Unmanaged by WC shouldn't be unmanaged?
If so, you can click on the button Unmanaged by WC and you’ll see the products listed. You can click on any of them to go to the product's page and check if you have the setting Manage stock? enabled:
Please, note that if you have this setting unchecked, it means that you aren't interested in managing the stock for that product and you only need to set its stock status manually.
To avoid misunderstanding, could you confirm that this is what you mean? Our support language is English, so I need to be sure that I understood you correctly.