Allow resizeable/full-screen file search form
Actually the file search UX in Windows has a design giving priority to form over function, with a concept half-way resembling a tray application notification.
The problem with that is that the ridiculous window size most of the time trims relatively long file paths to the point of having on-screen indistinguishable search results for different files, if they are at somewhat deepth in the file tree. The smallnes brings also unnecesary scroll, and forces the pains of a self imposed real-state screen-space shortage, more proper of mobile devices but undesirable in desktop.
Let file search have the first class interface power users demand to handle huge collections of files of tens of gigabytes.