Can Somebody at flynax please explain to me how the new bump affects listings order in categories, I am adding new listing, and regardless of if I sort by date ascending or descending, these new listing are not going to the top?

It may be somehow if there is a bumped item, regardless of when it was bumped it stays above ? or what does the bump actually do ? does it drop down after a while, if somebody could explain how this works it would be great, as it does not look good if you add a new item and for some reason it is no where near the top and can not be set to do so.

Also just as a side note I see categories come pre populated with sort by bump, how do I remove these options to sort from category sort options please ?

thank you Pete