When perspective of Controller Tester is broken

When testing is carried out by moving views in Controller Tester, the perspective may become strange as shown in the figure below.

You can restore the perspective via [Window] – [Reset Perspective…]. If [Reset Perspective…] does not solve the problem, reset the perspective using the method below.

1. Quit Controller Tester.
2. Delete the workspace_path\.metadata\.plugins\org.eclipse.e4.workbench\workbench.xmi file.
3. Restart Controller Tester.