Yes — to customize your UTM settings start by navigating to your Account Settings. Click the three lines in the top-right corner of your dashboard, then select Account Settings from the dropdown menu.
Once you're in, either scroll down or click on the Affiliates tab in the left-hand menu. Here, you can update your default UTM Source and Medium by entering your preferred values. You also have the option to customize your Campaign and Content parameters.
Be sure to click Update UTM Parameters to save your changes.