Explanation
As a system administrator, you can modify the rollup job recurrence pattern, postpone, pause, or resume the rollup job.
To pause, postpone, resume, or modify the recurrence pattern, you must view the system jobs. More information View Rollup jobs On the nav bar, choose Actions and select the action you want.
For the Calculate Rollup Field job, the available selections are: Modify Recurrence, Resume, Postpone, and Pause.
For the Mass Calculate Rollup Field job, the available selections are: Resume, Postpone, and Pause.
Note: Calculate Rollup Field is a recurring job that does incremental calculations of all rollup columns in the existing rows for a specified table. There is only one Calculate Rollup Field job per table. The incremental calculations mean that the Calculate Rollup Field job processes the rows that were created, updated, or deleted after the last Mass Calculate Rollup Field job finished execution. The default maximum recurrence setting is one hour. The job is automatically created when the first rollup column on a table is created and deleted when the last rollup column is deleted.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/data-platform/define-rollup-fields