I had the same requirement that you have, so I wrote a VBA Class module that easily adds this feature to any form.

To use this class, import the file into your project, then set your Form "Border Style" to "Sizable" and "Min Max Buttons" to "None".  This code does NOT include support to restore a Form to a Maximized or Minimized state.

Option Compare Database
Option Explicit

'  place this at the top of the Forms code module:
Private sl As New SizeAndLocation

'  place this in the Forms Open Event
Private Sub Form_Open(Cancel As Integer)
   Set sl.MyForm = Me.Form
End Sub

'  place this in the Forms Unload Event
Private Sub Form_Unload(Cancel As Integer)
   sl.Save
   Set sl = Nothing
End Sub

And that's all you need to do for each form you want to restore size and location.   The Size and location data for each form is stored in a table called "Orientation"

The code is stored in a GitHub repository.  Open my repo then click on the Green CODE button, and select download Zip.  Here's the link to the Repository.

https://github.com/NfaToys/Access-VBA-Classes