In No Split Mode, there is an issue.

Deleting orders cannot be done from the dialog box. Has to be done from the "orders" list. See the pictures here: https://www.warzone.com/Forum/640236-bugfeature-request-split-dialog-box

In large maps, finding the order in a big list is hard. I am playing 62nd move of big map no-split game and it's old now. Sometimes, must clear all orders just to correct one.
Please add a "delete" button to the above dialog box.

Alternatively, if you click the territory, the orders in the "list" should "filter" based on selected territory.