There are different ways to switch between the Integration, Profiling or MDM perspectives.
The options are as follows:
In the upper right corner of the Talend Studio main window, click the icon to display the [Open Perspective] dialog box.
Select the perspective you want to access, Integration for example, and then click OK to close the dialog box. The Integration perspective of your studio displays.
It is also possible, using the Window - Show view... combination, to show views from other perspectives in the open perspective.
Alternatively, you may also switch between different perspectives by doing the following:
On the menu bar, click Window > Perspective to display a list from which you can select the perspective to open.
Finally, you can also switch between available perspectives by simply clicking the corresponding icon on the upper right corner of the main window.