Live Activities are an interactive notifications feature by Apple on your lock screen that displays a live overview of certain apps, enabling you to stay up to date without having to unlock your phone.
In this case, it allows your notifications on different aspects of the Simple app to be displayed on your lock screen. You can choose turn on or off the Live activities for the Simple App.
You can manage Live Activities for the Simple app using two methods:
1. From Your Settings
Open the Settings app on your iPhone.
Scroll down the list of installed apps and select the Simple app.
Look for the Live Activities option and tap on it.
You can toggle it on or off to control whether updates from the Simple app are displayed on your lock screen.
2. Directly in the Simple App
Open the Simple app and click on your profile from the home page.
Navigate to the app's settings and click on Notifications.
Find the option for Live Activities and click on Edit activity
Toggle it on or off based on your preference.
If you have any questions or difficulties using the app, we would be happy to assist you—simply open the widget 
in the lower right corner and contact us.