Problem on word document open in maximize screen in word 365

Question

I have word document, open that word document in maximize screen directly when i using word 13/16 but problem on word 10/365 it has open but goes to task bar using VB.Net,

 

Please provide me solution....

 

What I have tried:

Dim WordApp As New Microsoft.Office.Interop.Word.Application
Dim DocToOpen As Microsoft.Office.Interop.Word.Document
DocToOpen = WordApp.Documents.Open(CStr(szDisplayFile))
WordApp.WindowState = Word.WdWindowState.wdWindowStateMaximize
WordApp.ActiveWindow.ActivePane.View.Zoom.Percentage = 100
WordApp.Visible = True
ActivateDocumentWindow(szDisplayFile)
WordApp.Activate()
Application.DoEvents()

Public Sub ActivateDocumentWindow(ByVal a_strDocName As String)
Dim Alllocal As Process() = Process.GetProcesses()
Dim Item As Process
'Loop through all processes to locate and activate our document
For Each Item In Alllocal
'if the main title is not blank
If Item.MainWindowTitle.ToString <> "" Then
If InStr(Item.MainWindowTitle.ToString, a_strDocName) > 0 Then
Dim intOurDoc As Integer = Item.Id
AppActivate(intOurDoc)
Exit For
End If
End If
Next
End Sub