You want to hide the details in the Time Sheet (see example below):
Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.
Employee Central - Time Sheet
It is not possible to hide this section, this is currently part of the UI and is not under permissions control or customizations.
hide time sheet details, time sheet details , KBA , LOD-SF-EC-TMS , Time Sheet , How To
SAP SuccessFactors Employee Central all versions