Starting with Windows 10 build 17040, Microsoft added settings that let you to view and manage your activity history, which Cortana uses to let you pick up where you left off.
Your collected activity history allows you to jump back into what you were doing with apps, docs, or other activities, either on your PC or your phone. To resume your activities, Windows needs to collect your PC activity.
If you like, you can enable or disable letting Windows collect User Activities.
If enabled, “Let Windows collect my activities” will be turned on for all users, but users will be able to turn this setting on or off for their account.
If disabled, “Let Windows collect my activities” will be turned off for all users, and users will not be able to turn this setting on or off for their account.
This tutorial will show you how to enable or disable Activity history settings to let Windows collect User Activities for all users in Windows 10.