Here are the available related lists on the baseline configuration when navigating to the Formula Indicators form: Breakdowns, Contributing Indicators, Time series exclusions, Targets, Thresholds, and Diagnostic Results.
'Signals' is not an out-of-the-box related list on the Formula Indicators form.
Use the Contributing indicators related list to navigate to the indicators used in the formula or their indicator sources. If you include another formula indicator in the formula, both that indicator and its contributing indicators are listed.