In Jira Cloud, there is no this option for Schedule trigger in Jira Automation. It resulted in each issue is reported as a single message in IM, which is not as expected.
Are you referring to the setting for Server automation that allows the schedule trigger with JQL to treat the issues as a batch?
If so, that is not an option for Jira Cloud. The equivalent feature is to use the Lookup Issues action to treat them as a batch. Unfortunately in Cloud, only some of the issue fields are currently available for Lookup Issues, and there is an open suggestion to add more: https://jira.atlassian.com/browse/JRACLOUD-75018
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