How to set menu opening from bottom to top?

Question

Python

I have 2 menus. One is at the top, the other is at the bottom.

The top opens quite correctly: from top to bottom. It looks like this:

spoiler

Код kv (вдруг нужен?):

AppMenu:
            top: root.height
            cancel_handler_widget: main_layout

            AppMenuTextItem:
            	text: "Импорт"
            	ContextMenu:
            		ContextMenuTextItem:
            			text: "Открыть файл"
            		ContextMenuTextItem:
            			text: "Подключиться к IP-камере"
            AppMenuTextItem:
            	text: "Сохранить результаты"

And with the lower already problems. The following happens to him:

spoiler

Код kv:

AppMenu:
            			top: root.height
            			cancel_handler_widget: main_layout
            			AppMenuTextItem:
            				text: "Воспроизвести"
            			AppMenuTextItem:
            				text: "Пауза"
            			AppMenuTextItem:
            				text: "Стоп"
            			AppMenuTextItem:
            				text: "Настройки "
            				ContextMenu:
            					ContextMenuTextItem:
            						text: "Изменить зону распознования"
            					ContextMenuTextItem:
            						text: "Полосы"
            						ContextMenu:
            							ContextMenuTextItem:
            								text: "Добавить"
            							ContextMenuTextItem:
            								text: "Удалить"

And I understand that it expands down because it is supposed to expand the menu, but at the same time I am more than sure that there is a way to make it expand up. But already what pages of both Google and Yandex did not show how. Maybe I was just looking in the wrong place.
That's why I'm looking for help here.