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Hi there,
You can edit the Local Group Policy to enable the administrative option.
-Open the Local Group Policy Editor
- In the left pane, click on to expand User Configuration, Administrative Templates, Control Panel, and Regional and Language Options
- In the right pane, double click/tap on hiding Regional and Language Options administrative options to edit it.
- Select either Not Configured or Disabled.
-Click on OK and restart this should make the tab to appear.
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