Quality comboboxes open their list of options depending on the position on the visible viewport.

  Either to the top or the bottom, depending on their position on the currently visible viewport.

The list also initially has the same width as the input, extending based on the length of their options. Either to the left or the right, again depending on their position on the viewport.

In this case, the combobox would likely open to the top, not interfering with the fixed toolbar on the bottom.

In all cases should the option list be above all other elements in z.

Quality comboboxes open their list of options depending on the position on the visible viewport. Either to the top or the bottom.

The list also initially has the same width as the input, extending based on the length of their options. Either to the left or the right, again depending on their position on the viewport.

In this case, the combobox would likely open to the top, not interfering with the fixed toolbar on the bottom.

In all cases should the option list be above all other elements in z.