Variable to subtract 1 page from total page count

 you'd need to set up a new variable - e.g. PagesInTitle-1


then at title level, above the actions that make your page number appear, modify the new variable with 2 actions:
1) on show>modify variable > PagesInTitle-1 > Value: var(PagesInTitle) > Set Variable contents
2) on show>modify variable > PagesInTitle-1 > value: 1 > subtract from Variable


then, in the Add Total Pages action at title level, you need to change the value from var(PagesInTitle) to var(PagesInTitle-1)

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