When you are in the new posts page, you can click on the filter to remove it:
Or you can use the filter options on the right side
If you want that the default landing "new posts" page shows all read and unread messages, you have to edit the template. It is a single line edit I think. Search the forums for it.
Try this for a similar result to the 24 hour thread view on vb. It's actually even better for forums that don't have a lot of posts every day as it pulls