Currently there is no OOB way to make the default Document Template for Document libraries as "None".
As a workaround, we can create a document library with “None” document template, then save it as a template named “My Document library”.
After that, create a new app based on My Document library instead of OOB document library app.
In this way, we could easily press New >My Document library and bypass 4 extra clicks by having to go into the Advanced Options settings.
If there is no “Save document library as template” option, please refer to following article to solve the issue:
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