Timeline is a feature that comes enabled by default, but you can completely disable the experience if you don't find a use for it.
Step 1: Open Settings.
Step 2: Click on Privacy.
Step 3: Click on Activity history.
Step 4: Clear the Let Windows collect my activities from this PC option.
Step 5: Clear the Let Windows sync my activities from this PC to the cloud option.
Step 6: Under "Show activities from accounts," turn off the toggle switch from all the accounts connected to your PC.