For example, when I want to add a new entry, I can see the mandatory fields that are not inside a tab page:

However, then I will save my entry and I get the following error:

My issue is that I currently do not know if a tab page contains a mandatory field. Right now I can only find out by saving or manually open all tab pages to check if it contains a mandatory field.

I see multiple options:

• Automatically open tab pages that contain mandatory fields which are empty.
• Mark a tab page with a red *, in the same way that is done on field level.
• Show a badge with a number of mandatory empty fields.