This is a Measurement ID, not a Property ID.

Where do I get the GA4 Property ID?

FAQ:
How do I use GA4Builder?
Does GA4Builder access my data?

Select a Report 👇

New vs Returning - GA4 Report        Save in GA4  
New vs Returning
Create a custom GA4 'New vs Returning' report and save to your GA4 library. It's the easiest way to create multiple reports across GA4 properties.

GA4Builder only works on desktop, so please come back on a desktop computer to create reports.