You can disable the timeline feature through Settings.
Go to Start>Settings. From within the Settings screen select Privacy>Activity History. From within the Activity History screen you then uncheck, "Let Windows collect my activities from the PC".
Also, at the bottom of the Activity History screen, there is a button labeled, "Clear activity history".
This will purge all of the collected data without disabling the feature.
I personally like the feature but, I also like to clean it out every few days.