
The only OOB solution is to add the classic calendar as a embed web part on modern page.
Here is a sample embed code for your reference:
You can click on the "Focus on Content" button on top right of the web part and keep the web part in a larger mode.
In addition, Microsoft is actually in the process of considering building a new calendar web part in modern experience.
Please see the UserVoice post here: Month view for calendar on the page.
Here is another post with similar request for your reference: calendar web part on modern pages.
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