Layout management...
By default, no changes need to be made here.
In the Window menu, click on Layout management.... [Layout management...]
-> The same-named dialog box is opened.
Select the view type on the left and the desired arrangement on the right.
Click Load.
-> The desired layout is immediately loaded.
Recover standard
May be some docking windows had been moved in order to try out something and now you want to return to the default settings.
Simply click on Restore default [Recover standard].