A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Dear yuyuringi,
Greetings! Thank you for posting in Microsoft Community.
I went through your post and also tried testing Japanese PDF files and images which have Japanese texts in the latest version of OneNote for Mac. I can confirm that I reproduced similar situation as you described. After using OCR feature, the result has spaces between words.
I do understand the inconvenience caused and feel very sorry about it.
Given this situation, I sincerely recommend you use Feedback tool inside OneNote to report this behavior. You may click Help menu > Send Feedback > I don't like something.
Or click the feedback tool from upper-right corner(as shown below)>choose I don't like something.
Feedback submit by this way directly goes to the related team. This is the best way to let OneNote developers aware of this situation and also know your requirements, your input will help improve the product and make it better for you and others.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Tina | Microsoft Community Moderator