Default language English stops working when message received in another language - Outlook 365

So is there a way to stop the following..
I have the English language spellcheck enabled. A message is received in e.g. French. The reply is in English. The spellcheck for English stops working - unless the user goes back and resets the language. Any ideas on how to ensure the default reply/send language remains in English..
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Jackie Man IT ManagerCommented:
In Outlook 2016

Open a new email message.

On the Review tab, in the Language group, click Language.

Click Set Proofing Language.

In the Language dialog box, uncheck the Detect language automatically check box.
agwalshAuthor Commented:
Thank there a way to set this as the default? Thanks
Jackie Man IT ManagerCommented:

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