How do I know if I’m using Universal Analytics?
Google Analytics 4 came out on October 14, 2020 and became the default, so if you created your property after that date, you’re likely using GA4. If you were using analytics prior to that date, you’re likely using UA.
If you’re not sure, you can check your property type by clicking on the down arrow in the top left of your account, next to your property name:
Then look at your property ID:
UA property IDs start with UA and end with a number.
GA 4 properties only have numbers.