This article explains why the number of eligible visitors shown in a segment can change when that segment is applied to a guide. This behavior is expected in multi-app subscriptions.
Product area: People > Segments (web, mobile)
Segments created on the Segments page evaluate all visitors in your subscription across all applications. When you apply a segment to a guide, only visitors with that activity in the guide's application are evaluated against the segment rules.
For example, a segment might include visitors A, B, and C when evaluated across your subscription. But when applied to a guide associated with Application 1, only Visitor A is included because they're the only one with activity in that app.
The following segment looks for visitors with a value for "email". On the Segments page, the number of Eligible Visitors is 1039. In this multi-app subscription, these 1039 Visitors have used at least one of the applications in the subscription that Pendo has collected events for and have also met the segment criteria (having an email).
If the same segment is applied to a guide, the eligible visitor count only includes visitors with activity in the guide's application.
To find which application a guide is associated with, look for the application icon in the top-left corner, underneath the guide title.
Applying the example segment to three different guides that are each associated with a different application displays different results.
For more information about segments, see Segments and Segment rules.