Dim l_wksSheetToChange As Worksheet
Dim l_chkCheckbox As CheckBox
Set l_wksSheetToChange = ThisWorkbook.Sheets(1)
For Each l_chkCheckbox In l_wksSheetToChange.CheckBoxes
l_chkCheckbox.Placement = xlMove
l_chkCheckbox.LinkedCell = l_chkCheckbox.TopLeftCell.Address
Next l_chkCheckbox