[GA4] BigQuery Export schema – Analytics Help – Google Help

For each Google Analytics 4 property and each Firebase project that is linked to BigQuery, a single dataset named “analytics_” is added to your BigQuery project. Property ID refers to your Analytics Property ID, which you can find in the property settings for your Google Analytics 4 property, and in App Analytics Settings in Firebase.

https://support.google.com/analytics/answer/7029846?hl=en