You're able to disable this notification in the Config File or through the Preteen Settings Pie menu. The startup notification also says the current mod version which makes mod support easier. Startup Notification: I added a startup notification with a link to the discord server for support & also a link to the mods info page. You'll also be able to shrink sims down to preteen height (even works if they aren't preteens) & reset them to their normal height. Preteen Base Settings Pie Menu: This is where you'll have the option to add/remove the preteen trait. It also has a 'Current Settings' interaction that lists out the current settings.
Config Settings Pie menu: This allows you to change various settings such as the chance of having dry skin, Agespan length, Enabling Aging, Toggling the Startup Notification.