Just like many other sotfware solutions in the market, it would be very helpful if one could customize the workspace, for example, moving the toolbox to the right side of the main area or the development tabs to the top, etc, or even add my own shortcuts to the toolbar, show my favourite or most used widgets in the toolbox, etc...
Customization should be only the first step, it should also allow to create a new MainEditor for side by side comparison, create different workspaces for different purposes (debugging, screen development, data modeling, etc).
For reference this is how Service Studio is presented today:

Source:
https://success.outsystems.com/documentation/11/getting_started/service_studio_overview/
And I believe it has barely changed since the first versions. Its time to give it some refresh.