When you create new Tasks, the reminder button is selected by default. The reminder can be turned off through the following methods:
Note: If Activity reminders isn't available in your settings, you must enable it first.
Note: Disabling Task reminders in Classic will also disable reminders in LEX. Therefore, if LEX task reminders is on, but Classic task reminders is off, the task reminders won't work in LEX. If end users need LEX task reminders on, end user need to make sure both LEX task reminders and Classic task reminders are on.
Enable or disable pop-up reminders for Tasks and Events in your Org
Activity Reminders and Notifications in Salesforce Lightning Experience
Start Using Tasks
Limitations of Task notifications in Lightning
Customize Task Assignment Notification Emails
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