Summary:
The Offline button on the timesheet is visible only when the authentication type is set to Web TimeSheet Internal under the user's profile. SAML is an unsupported authentication type.

Resolution:
  • Log into Web TimeSheet as the administrator.
  • Click on the Administration icon at the top menu bar.
  • Select Users from the left pane, under the Users/Departments category.
  • Pick the user for whom the authentication type need to be verified or changed to Web TimeSheet Internal.
  • Click the Edit button (represented by a notepad & pencil icon) next to the user name or double-click on the user name.
  • Click the drop-down next to Authentication Type, under the Access tab.
  • Pick Web TimeSheet Internal from the drop-down.
  • Click Save.

Note:
Refer the attached screenshot for illustration.