SpellCheck in outlook change into US english from UK English when you reply for an email from USA

Z

ZielonySBS

As in a Subject the SpellCheck automaticaly always reverts to English (US)

Whats more it underlines words which are already added to a custom
dictionery and now if you event want to add them again you can not bacouse a
button (add to a dictionery) is noc active.

Please help I have been fighting with this issue for about a year.

Is any way complitely remove US English from a spellcheck?
 
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