1. Disable “duplicated code” detection
   • Settings → Editor → Inspections → General → Duplicated Code
   • (Or better) in the source code, use @SuppressWarnings(“Duplicates”)
   • Ref.: stackoverflow
2. Show source file structure
   1. From menu: “View” -> “Tool Windows” -> “Structure”
   2. Quick key: CMD + 7
3. Reformat all codes under a folder: in Project view, select the folder, then Code -> Reformat Code