There is no easy way to navigate an interaction start and end point in prototyping mode on large pages.
At the moment, you should either:
- Use the connector to identify the start or end, by zooming out. (Fortunately, if you select a frame or connector, other connectors are hidden)
- In order to navigate to the destination frame, select the starting layer, switch to the inspect panel, then locate that interaction in the interactions section, and click the link in the “Navigate to” row.
It would be convenient if there were shortcuts for jumping between the beginning and ending of an interaction when it’s selected.
As a suggestion < and >, or > and shift + > are meaningful for shortcuts.