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• Here is how to crop picture inside LibreOffice Writer environment, https://ask.libreoffice.org/en/question/1256/crop-pictures-in-writer/.
• The person here suggested to the crop image before used in LibreOffice Writer.
• However, I found that the basic crop feature in LibreOffice writer works fine. So, at least the feature works for my need, I do not need to crop the picture with another application.
• You can crop image in LibreOffice Writer by right clicking the image and then choose "Crop Image".
• Here is the screenshot I took from the discussion.