You can write the macro code to open and close the previous form. Then call it from the button click.
VB Code:
  1. 'Behind Main form:

  2. Option Compare Database

  3.  
  4. Private Sub cmdCustome_Click()

  5.     DoCmd.OpenForm "Customer", acNormal, "", "", , acNormal 'Show desired form

  6.     DoCmd.Close acForm, "Menu" 'Close Main form

  7. End Function

  8.  
  9. 'Behind Customer Form:

  10. Option Compare Database

  11.  
  12. Private Sub cmdBackNav_Click()

  13.     DoCmd.Close acForm, Me.Name 'Close current form 

  14.     DoCmd.OpenForm "Main", acNormal 'Return to Main form

  15. End Sub