You can find the user settings menu item in the upper right corner of the Reporting page.

Size of the pagination: You can set the initial page length of Worklog details and Quick summary reports. This option will change the number of rows to display on a single page in the reports.
Logged Time export format: Select the time format that appears in the exported reports. You can choose between these two options:
- Seconds: times will be in seconds
- Default: what you can see in Logged Time column based on the selected Time format
Time format: Time spent, time estimates, etc will be displayed in the selected format. You can choose between these two options:
- Default: the configured time format in JIRA's Time Tracking settings.
- Decimal: logged hours will be displayed in decimal number format.

Time format option

Changing the Time format will also change this option in the Timetracker user settings.

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