In this combo box you can select the target entity for each search. This combo box contains the list with all the entities in the active canvas.
If this field is empty, the target entity can be any entity in the canvas and the search results will include all pathways beginning in the Search From.
If this field is not empty the search results will include only those pathways that start in the Search From entity and end in the Search To entity.
Use this field, if you want to find a pathway between two entities (entity-to-entity pathways) only. Otherwise, if you want to find a subnetwork around the starting entity leave this field empty.