I am not able to disable/Revoke this permission. Found the setting name in two nodes (projects and project preferences, but those settings did not block the ability to check the box and save the project)
Solved
Construction/Projects - Security - Can't REVOKE "Allow Adding New Items on the Fly" checkbox on Projects screen on the Summary tab.
Best answer by ed.goodman
I was able to find and revoke access to this node in access rights by screen.
The path here is Construction > Projects > Project.
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