You can't change the navigation order, DVDA decides which button to go to next according to which one it thinks is closest to it vertically and horizontally, but the routine that does that is easily fooled by long text entries according to another thread I read in the forum some time ago.

You can however change which button is first, and therefor which button is highlighted when the menu first starts playing. But DVDA will take it from there.

The first button you create on the menu becomes this default button, and will remain so even if you move it around. The navigation order of the other buttons change as you reposition them, but the default button is always first, no matter where you move it.

If you delete the default button, then the next button you created will become the default button. That is why jetdv's post will work to remove your back button from the default, but what button becomes the default depends on which one you created next.

You can manually set a button to become the default. (This is the only button which DVDA let's you edit the navigation order of).

To do this, make sure the "selection tool" mode is set by clicking the arrow button on the left tool bar that is left of the sizing tool at the top of the tool bar. Also go into the Options menu and select "Show object order". You will now see little numbers at the upper left of each object on the menu (If you see 2 numbers, one in parenthesis, then you still have the sizing tool selected). Note that this is not the navigation order, but rather the layer order. If you were to overlap the button graphics, this is the order in which that overlap will take place, with 1 being the layer closest to the "menu surface" itself. The first button you create is closest to the menu, that is, at the bottom of the layer stack. And it is this "bottom" button that is the default button for the menu.

You can change the layer order of any button. When you change its order to make it the bottom button, you make it become the default button, the button that gets selected when the menu begins playing. To do this, highlight the button whose order you want to change. In the Edit menu, there is a sub menu called Object order. You can move the button up and down the order one at a time using the bottom two items in the menu. (Remember, this is just the graphical layer order, not the navigation order). But the easiest way to make it become the default button is to just send it to the bottom using the "Move to bottom" option, or instead of using this menu, just press control-end when the desired button is highlighted, and now it it at the bottom of the layers, and is the new default button.

So what if you want the button at the top of the layers to be the default, you know, the one closest to the user, the one not layered over by the other buttons so it looks like it should be the top button? Nope, can't do it. Eventhough common sense would tell us this should be the default button, it is the bottom button that DVDA selects to be "first". Just another one of those weird things DVDA does for us, whether we want it to or not!