Go to
C:\Users\X\AppData\Local\UnrealEngine\Y\Saved\Config\Windows
X = “YourAccountName”
Y = “EngineVersion” for example 4.27
For 5.6 It’s under
C:\Users\X\AppData\Local\UnrealEngine\5.6\Saved\Config\WindowsEditor
Search for EditorSettings.ini
Open this file and search for
[/Script/UnrealEd.EditorSettings]
If above line doesnt exist create it and add below lines:
LocalDerivedDataCache=(Path=“%GAMEDIR%DerivedDataCache”)
SharedDerivedDataCache=(Path=“%GAMEDIR%DerivedDataCache”)
Save file and after saving do not run editor yet until you mark file to be READ ONLY!!!
Right Click EditorSettings.ini go to Properties and Check Read Only and apply.
Done