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Raghavendra M 13Raghavendra M 13 

how to write showHeader is equal to false when lighting component is overrided

Please Try below code.
<apex:page controller="testController" showHeader="{!$User.UITheme == 'Theme3'}}">
Please Use this salesforce documentation for more information.

Raghavendra M 13Raghavendra M 13
Not a visual force i want to hide showheader in lightning when lightning compoent is overriden