When previewing a report, such as an income statement in FE NXT webview, the timestamp still appears even after the option to show the date/time may be turn off on the report parameter in database view.
This has not yet been added to FE NXT Webview, but should be added in time.
This idea is currently in our FE idea portal. You can add a comment and vote the idea and others to help with prioritizing.
Alternatively, export the report using the "Export Excel Data" option, as this option exports without any break in the data and does not include any time stamps/page numbers.