Worked on the FreeCAD/FreeCAD repository to improve the stability and user experience of the application's Start view. Focused on a targeted bug fix, ensuring that closing the Start view tab only affected the intended QMdiSubWindow rather than terminating the entire application. Utilized C++ and header files to refactor code, updating helper functions by removing constness in postStart calls to better align with the revised GUI lifecycle. Applied widget manipulation techniques, including safe parent-tree traversal, to accurately identify and close the correct tab. Maintained isolation of changes to the Start view, preserving stability and preventing regressions in other modules.