Hi Nigel
My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.
Your screenshot did not come through.
Unfortunately, Windows Mail is not as full featured as the Outlook client you describe.
You are probably best off using an alternative client such as the free Mozilla Thunderbird:
http://www.mozillamessaging.com/en-US/thunderbird/
I would also recommend you submit a feature request; send me the short link so I can vote on it and bring it to the attention of the Windows engineers.
https://windows10.help/blogs/entry/54-how-to-su...
Information in the above link is sourced from a trusted Microsoft MVP blog.
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.