I’m using an iPad with IOS 26.2 and have several email accounts (mainly outlook and gmail) using the apple mail app. I have set the default email in the app settings composing section to the one I want for most emails. When I open the app it defaults to show the new and existing emails in all the inboxes. If I then tap on the compose new email icon, instead of it being sent from the default email address, it selects the email which happens to be open in the inbox as the source.
I understand that it would select this address if I was replying to the particular email, but is there any was of forcing it to use the default address for composing new emails. At the moment, I can’t see the point of having a default email address for composing if it is not being selected!