Hi @洋遠42484543 do you mean the application frame with the tool bars, menus, option bars, panels etc or do you mean the workspace around the image canvas? You can hide the application frame with the Tab key to show just the image itself or "F" to rotate through various full frame options.
Thank You for your kind information, it is very useful for me !
But this can hide selected one file, I hope to hide all multiple files at the same time. When two files as attached Photo A, I hope to show as Photo B, to hide both "File Bar" on File "1" and File "2" at the same time.
If it can do, I can check image on the PS work pace when combined, easily.