没有实验性功能的看过来，可以强制ps的所有UI跟随系统缩放，操作系统级别的，无论PS有没有内置这个功能，唯一不好的是，编辑区图片享受不到4K的好处，算是4K显示器的迂回解决办法吧：
1.打开注册表Win+R输入regedit
2.找到HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Windows > CurrentVersion > SideBySide，在SideBySide右键新建一个DWORD(32位)值，名字为PreferExternalManifest，值为十进制1，保存退出
3.新建一个文件photoshop.exe.manifest，注意后缀就是manifest，放入photoshop.exe同一文件夹下，写入以下内容，保存后，重启PS调整为正常尺寸即可


<?xml version="1.0" encoding="UTF-8" standalone="yes"?>


<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">


<dependency>
<dependentAssembly>
<assemblyIdentity
type="win32"
name="Microsoft.Windows.Common-Controls"
version="6.0.0.0" processorArchitecture="*"
publicKeyToken="6595b64144ccf1df"
language="*">
</assemblyIdentity>
</dependentAssembly>
</dependency>


<dependency>
<dependentAssembly>
<assemblyIdentity
type="win32"
name="Microsoft.VC90.CRT"
version="9.0.21022.8"
processorArchitecture="amd64"
publicKeyToken="1fc8b3b9a1e18e3b">
</assemblyIdentity>
</dependentAssembly>
</dependency>


<trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
<security>
<requestedPrivileges>
<requestedExecutionLevel
level="asInvoker"
uiAccess="false"/>
</requestedPrivileges>
</security>
</trustInfo>


<asmv3:application>
<asmv3:windowsSettings xmlns=" http://schemas.microsoft.com/SMI/2005/WindowsSettings ">
<ms_windowsSettings:dpiAware xmlns:ms_windowsSettings=" http://schemas.microsoft.com/SMI/2005/WindowsSettings ">false</ms_windowsSettings:dpiAware>
</asmv3:windowsSettings>
</asmv3:application>


</assembly>