The amount of fields in one template, templates in your collection, and clauses in your clause library you can have depends on your current Woodpecker subscription. At any time, you can view your current usage from directly within the Subscription section of the app, as seen below.

To navigate to the Subscription section, first click on the main menu hamburger icon on the top left of the application, then choose "Subscription". Please see the below gif for this in action.