Click and drag the edge of the frame you want to resize, works in PS6 so hopefully the same for you.
Easy peasy....Get another screen, even an old one and use two screens. One for your tools and one for your image as you edit. Problem solved. I used to use an old computer screen for my tools, now I have a 27" as an editing screen and a 24" for my tools. Laptop is now reserved for internet search and travels...and email unless otherwise uploading an image...
I figured that it would be in preferences...it is. Preferences>Interface>UI Scaling...change to 100%
They have also done away with the "Save for Web" option...what is now used?