Want to hide fields from the users

In timesheet doctype there are fields which i don’t want my users to see.

I want this whole section to hide and also employee details section

Edit: if you want to hide the whole thing for you and your members (does not apply to your business/flow) then simply customize the doctype, go to the section break and set it as hidden.
Otherwise if you want to hide it from certain members, check the link above.