Did you try resizing the Debug Configurations window? It should look like the attached one, when displaying the Startup tab; if it does not you may want to update your installation (Help >> Check fr Updates...). If you still have display problems, it may be due to your graphic driver or some installation problem, either of your OS or System Workbench.
By the way which OS platform are you using? Windows, Linux, MacOS/X? 32 or 64 bits?