This article lists a known compatibility issue that you may encounter when running Photoshop on macOS 10.13 (High Sierra) and provides solutions to avoid that issue.
Adobe has discovered the compatibility issue listed below with running Photoshop with macOS 10.13 (High Sierra).
Adobe strongly recommends that customers update to the Photoshop CC 2017 release prior to updating to macOS 10.13 (High Sierra). Older versions of Photoshop were not designed, nor extensively tested to run on macOS High Sierra. Additionally, we strongly recommend that customers do their own testing on a non-production partition to ensure that new operating systems work with their current hardware and drivers (printing, etc). You may wish to remain on an older version of the OS that is compatible with prior versions of our software.
If you do encounter issues not already documented, feel free to report them on our feedback site.
Photoshop CC 2017 or earlier
macOS 10.13 High Sierra
Adobe has discovered the compatibility issue listed below when running Photoshop CC 2017 and earlier releases on macOS 10.13 (High Sierra).
The 10.13.1 update to macOS High Sierra resolves this issue. The information below applies only to macOS High Sierra 10.13.0.
The Photoshop document window does not expand to fill the entire display when the macOS Dock is shown. The problem does not occur if the Dock is set to “Automatically hide and show”
Download OSXCompatibilityPlug-in.zip to your computer.
After you download the OSXCompatibility plug-in package file above, double-click it to decompress it. If asked, extract all the files.
Copy the OSXCompatibility.plugin file to the Plug-ins folder inside the Photoshop application folder:
Applications/Adobe Photoshop [Photoshop_version]/Plug-ins
Our engineering team is working with Apple to correct the root problem as soon as possible.