Portrait Images Appear Too Big in Bimber theme

My site has been on Newspaper theme for years. Now, I have changed to Bimber, but there is one thing I can’t get straight, that is image sizes, The portrait images appear so big (full size) with in posts. They are already resized and appear perfect on my previous Newspaper theme but in Bimber no matter what I do they appear too big. What can I do sort this problem out.

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