Hi,
I suggest you refer to this support article, as the article said you can export a diagram as a PDF file and print in PDF:
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Hi,
you can try to give a feedback to Microsoft about this behavior:
https://support.microsoft.com/en-us/office/how-do-i-give-feedback-on-microsoft-office-2b102d44-b43f-4dd2-9ff4-23cf144cfb11
Microsoft values your opinion. Your feedback goes directly to our engineers and helps us shape the future of Microsoft products and services for all our users.
copy and past into Excel... then print. It is the only way i have found it to work when i can get more that all on one page or only the first page.
hope this helps.