Photoshop window does not fit on my laptop screen. How do I resize to the smaller screen?

thanks so much for the answer "check-off the  Windows > Application Frame"  

Was camping near White Sands. Had tons of great fotos that I, luckily, worked on in Bridge/Raw.  Could not fix the problem 'cause no internet. Had to wait to get home to work on them on my big screen. 

This is a typical major problem with a tiny solution.  

this has been bugging me for years and never knew a simple solution. Thank you!

This works on windows 10 maybe on Mac too: Change resolution in the OS and change it back. Resizes the PSCC window to fit the desktop resolution.

This has not been answered for me. Here is what worked for me in Photoshop CC

Edit---menus--application menu---click on fit on screen and --fit artboard on screen

Thank you so, so very much! You just solved a problem that had been creating challenges for me! I am so grateful to you!

If you have a Mac, just toggle the green button in the upper-left hand corner.

Windows: see this article How to Use the Keyboard to Move or Resize a Window that is Too Big for the Screen

Does your system still think the larger monitor is present?  Maybe you you need a reboot?

-Noel

What is your screen resolution?  Does it meet the Photoshop minimum screen size requirements?

Adobe Photoshop CC for Mac, Windows, PC - Tech specs

-Noel