Transparent search bar
I also suggest in addition to show it on hover even on the top, to make the search bar completely transparent, it will give a more classy appearance IMO, maybe it can also be thinner.
The transparency idea can maybe be considered for the left summary column. Something more light and aerial.
We removed the search bar from the toolbar, now there’s a small search button instead. When you click it, you’ll get a full-screen search with a semi-transparent background. Hope you will like it :)