I'd open one with the issue and hold down the Ctrl key and press the - key or Ctrl key and roll the mouse wheel to resize the contents of the window. If there's a readability issue might right-click the Desktop and check Resolution setting, sometimes the Recommended isn't the best for the purpose.
I am only up to outlook 2016. If I click an email item, it is thrown to the right (or down, according to your configuration?). I then double click it and it opens fully, for reading, with the scroll bar.
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