I have created 3 components as follows.
Page_Header: (Hamburger Icon, Back Button, Co Logo, Screen Name, User Icon, UserName and Settings Cog)
Navigation Menu: (Gallery : Items = Navigation_Menu table - set in App.OnStart)
Settings Menu: (Gallery : items=Settings_Menu table - also set in App.OnStart)
* Both menu's have a number of custom properties (see attached image).
On the page Header/Hamburger_Icon/OnSelect=Set(Var_Show_Menu, !Var_Show_Menu)
The Navigation Menu/Height_Menu * =If(Header_1.Show_Menu_Header, (CountRows(Navigation_Menu.Items)*(Navigation_Menu.Text_Size_Navigation*2.1)),0)
This work, so long as I click the hamburger Icon.
But how do I change the value of Header_1.Var_Show_Menu (or Header_1.Show_Menu_Header) from the Navigation_Menu's OnSelect property. (So that I can hide the menu again, after the users has clicked an item)

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