A little help here?

Any idea how I can get rid of the Eternal Hero monument and redisplay the DoA?

You may need to cycle through the "Rearrange the display" button a few times for it to shift the order around... if I'm understanding your question correctly.

Go and try your HoM, normally it just shows a button saying "Display the Eternal Conquerer of the Domain of Anguish" botton, but now all of my display buttons have disappeared. :[

Once you have displayed them once all you can do is rearange the order, and the order is based on what order you added them to the HoM.

This is a source of frustration for lots of people as you can't get the 5 titles you like best to display.