Bing decision search offer refreshing way to search web. Just like Google search it has auto suggestion drop down box. This can be useful for some users while other users might find it really annoying. You can easily disable or turn off this auto suggestion box and search on Bing in peace.
Disable Auto Suggestion box
1. Open Bing decision search.
2. Then click Extras > Preferences (top-right).
3. Under web settings, uncheck (no-tick) next to “Turn suggestions on” for Search suggestions. Click save changes and pop-up suggestion box should not appear.

You can directly turn OFF suggestion box by clicking Turn OFF link at the bottom of suggestion pop-up box (see image). Also see: disable auto suggestion Google Search
Awesome help! Thanks!