A property can be favorited in Prospektr either individually or as a batch. There is an “Add to Watchlist “ button on the right side top of the search results page, click on it to add to watchlist/ favourite all the selected properties, these properties can be classified into a group based on the filter parameters applied.
Alternatively, you can click on a particular property to open a window providing the details of the property. Click on the heart symbol to favorite the property. All favorite properties are indicated with a heart within a dot in the map view.