To analyze the performance of your configuration, power our insights reports and support personalization, we capture key e-commerce events on your platform. These are events such as product views, item clicks, add-to-carts, and purchases.
To automatically enable Event Tag events, go to Stores > Configuration > Catalog > Tweakwise. Look for Send analytics events to tweakwise and set the value to Yes.
From version 8.7.0 the setting can be found under the section General:

In earlier versions, the setting can be found in the Merchandising Builder section (in some versions Personal Merchandising subsection):

Notes
- Automatic support for Event Tag events is available from:
- 8.3.2 (default) or 4.3.0 (Hyvä) has support for search phrases, product view and purchases.
- 8.5.0 (default) or 4.4.0 (Hyvä) also includes support for item clicks.
- Varnish (or a similar caching proxy) must be enabled and properly configured for personal merchandising to work properly in cached blocks. Enabling this can have impact on performance, caching of ajax filter requests will be disabled for requests which have a profile cookie value.