Hi Tahir,
Could you please tell what UI5 library version you are using.
You could update to 1.18.9 if you are on lower version.
Also could you please let us know which Timesheet app you are using?
Is this from wave1 or Wave?. We have enhanced the app in wave2 version.
What is the SP version of the Ui component?
Best Regards
Pankaj