Favourite searches (not favourite Data Explorer sessions) can be added or changed at any time. The options available are linked to the entity chosen so will always be available for new sessions carried out on that entity.
Select favourites either by either selecting a current search and clicking Add to Favourites in Search Tools or by clicking Manage Favourites in Session Actions.
Use the left arrow and right arrow buttons to add or remove items from the Available Searches and Selected Searches column.
Use the up arrow and down arrow buttons to change the display order for your favourite searches.