Setting a Default Workbook Window Size and Zoom Level

I get very upset by the way others set up their workbooks.
To avoid these annoyances I have set my default excel settings in my personal macro book, in a sheet I set my default settings:
Formula visibility
Grid visibility
Application window size
Zoom
Etc
These settings are executed when the personal macro book is opened and in the workbook before close event
When another workbook has other settings these will temporarily apply until it’s closed

Further to my earlier comments, it is likely Windows that remembers sizes of various program windows, not specifically Excel.
The end result is the same though.

To specify the position and size of each workbook when it is opened, including a new workbook, put this code in the ThisWorkbook module of Personal.xlsb or an Excel add-in file (.xlam). If the workbook's window is Normal (not Maximum or Minimum), this code positions its top-left corner at (450,0) pixels and its bottom-right corner at (1650,1040) pixels; adjust those values as required.
This code runs automatically; it is not a macro requiring manual activation.

Private WithEvents App As Application 'locate before procedures

Private Sub Workbook_Open()
Set App = Application
End Sub

Private Sub App_NewWorkbook(ByVal Wb As Workbook)
App_WorkbookOpen Wb
End Sub

Private Sub App_WorkbookOpen(ByVal Wb As Workbook)
Const PtPerPx As Single = 72 / 96 'points/pixel
With Application
If .WindowState = xlNormal Then
.Left = PtPerPx * 450
.Top = PtPerPx * 0
.Width = PtPerPx * 1200
.Height = PtPerPx * 1040
End If
End With
End Sub

Private Sub App_WorkbookDeactivate(ByVal Wb As Workbook)
With Application
If .Workbooks.Count = 1 Then 'last workbook closed
.Visible = False
.Quit
End If
End With
End Sub

See https://sites.google.com/view/MyExcelToolbox

What I said in my earlier comment applies to the window position too.

Excel seems to remember the size of its window when you last closed it. Any next session will automatically start with this size of the window, whether you just start a new session with the default blank workbook, use a template or open an existing file. This size can be probably modified by a Before_Close macro.

There is an exception to that if you use a shortcut somewhere (Desktop, in the file explorer, in the start menu, on the taskbar, etc), in which it is specified to run the program in a maximized window. In such case the program will always open with the window maximized.
Also, if the last session you closed was in maximized window, and the shortcut specifies normal window, it will still open in maximized window as this is the last remembered one and it becomes a new normal.

The shortcut can point to the Excel program itself, or to any Excel files or templates. It could also point to another shortcut, but I did not check setting of which takes precedence.

This is one of the very few things that aggravate me about Excel — its seemingly random sizing and placement of windows when creating or opening workbooks. Long ago, I created a macro similar to your CNWkBk2 and put a button for it on the Quick Access bar. I’ve just gotten into the habit of clicking that button every time.