Select Template in email editor

How and where can I select a template for an email? I can find “Signatures” and “Quicktext” in the menu, but no button for "Templates.

I don’t want to start via NEW - EMAIL - TEMPLATE; which seems to be the recommended (and only?) workflow.

I want to use it just like you use Signatures or Quicktext but take advantage of a Template feature, that is automatically filling in the subject line.

Thank you

Unfortunately you can’t change the template once you have started composing the message.

That is not what I want anyway

I want to select (applyl a template to a message just like I’d do with signatures or quicktext