With Orgname and Sider with Main Tab

/ - MainNavigator
    /:orgName(screen) 
    /:orgName/MainDrawer
        /Sider1
        /Sider2
        /BottomTab
            /Tab1
            /Tab2
    /login
    /password-reset   

Generated Component from above routes.

<Stack name=“MainStack”>
    <Stack.Screen name='orgSelection'/>
    <Drawer.Navigator initialRouteName="Drawer">
        <Drawer.Screen name="Sider1" component={Sider1} />
        <Drawer.Screen name="Sider2" component={Sider2} />
        <Tab.Navigator>
        I   <Tab.Screen name="Tab1" component={Tab1} />
            <Tab.Screen name="Tab2" component={Tab2} />
      </Tab.Navigator>
    </Drawer.Navigator>
    <Stack.Screen name='login' />
    <Stack.Screen name='password-reset' />
</Stack>

With Orgname and Sider only

/ - Main Navigator(StackNavigator)
    /:orgName(screen)             -[//:orgName, exact: true] -> org selection page will open and orgname is selected, which will redirect to home
    /:orgName/MainDrawer         -[//:orgName/l/] MainStack.Drawer
        /account        -[//:orgName/l/account]   MainStack.Drawer.Account
        /home           -[//:orgName/l/home]      MainStack.Drawer.Home
    /login
    /password-reset   

Generated Component from above routes.

<Stack name=“MainStack”>
    <Stack.Screen name='orgSelection'/>
    <Drawer.Navigator initialRouteName="Drawer">
        <Drawer.Screen name="Home" component={HomeScreen} />
        <Drawer.Screen name="Account" component={AccountScreen} />
    </Drawer.Navigator>
    <Stack.Screen name='login' />
    <Stack.Screen name='password-reset' />
</Stack>

Without orgName

/ - MainNavigator
    /                   -[//]          -> this screen checks if user logged in, if logged it redirect to home screen
    /MainDrawer         -[//l]
        /BottomTab      -[//l]
        /account        -[//l/account]
    /login
    /password-reset