Within the Rule Factory, there is a Presentation tab. 

For each rule, there are presentation settings. This determines when a rule violation displays on the Gantt chart or in the Legality Detail view. They do not influence the rule's calculation or outcome.

Forward and Backward Display Range

These settings control the display window relative to the current UTC time:

• Backward Display Range: Specifies how many days into the past a violation should be displayed.
• Forward Display Range: Specifies how many days into the future a violation should be displayed.
  
  

Example

For an Under Coverage rule, setting Backward Display Range to 0 and Forward Display Range to 60 means violations are only displayed for future flights and no more than 60 days in advance.

Display Range Mode

This setting specifies the specific date or time that must be visible on the Gantt chart for the violation to appear.

Setting	Description	Applicable Rules
Always	The violation displays if any day covered by the violation is currently visible on the Gantt chart.	All
Time Index	The violation displays only if the specific Time Index (a customizable date/time value derived from the rule's calculation) is visible on the Gantt chart.	All
Period Start	The violation displays only if the start date of the period (e.g., the first day of the month) is visible on the Gantt chart.	Period Rules only
Period End	The violation displays only if the end date of the period (e.g., the last day of the month) is visible on the Gantt chart.	Period Rules only

Note: A Period Rule uses long-term aggregated legality values (like an accumulator), such as a yearly Blocked Hours (BLH) rule.

Example: Monthly OFF Violations (Period Rule)

Assume a monthly OFF rule is violated for August 2026:

• With Always: The violation displays if any date in August (01 Aug 2026 through 31 Aug 2026) is on the Gantt.
• With Period End: The violation displays only if 31 Aug 2026 is on the Gantt.
• With Period Start: The violation displays only if 01 Aug 2026 is on the Gantt.
• With Time Index: The violation displays only if the rule's calculated Time Index is on the Gantt.