We've made a big change to the (F4) master data search to help with usability.

Previously, the search window would appear at the bottom of the screen. Feedback said it was taking up valuable space and made it difficult to see and navigate around the document. 

Now when you open search (by pressing F4), it will appear in a new dialog which you can move around and position where it's convenient for you without it impacting your view of the document.