Yes of course. Adjust the "if" statement to call setItems when the selection isn't blank or one of the change items.
Like this.
var ITEMS = [[" ", ""], ["ABC"], ["DEF"], ["HIJ"], ["KLM"], "ITEMS"];
var DETAILS = [[" ", ""], [123], ["456"], ["789"], ["101112"], ["GO BACK..."]];
if(event.value == "GO BACK..."){ event.target.setItems(ITEMS);}
else if(event.value == "ITEMS") { event.target.setItems(DETAILS);}
else if(event.value != ""){
SetFieldValues(event.value)
}
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