Use UI files to construct widgets
Currently, all the widgets are hand written manually in the source code of the app itself. Most of the GNOME apps uses UI files that can be created using Glade
In order to simplify the re-design task during the GSoC/Outreachy project this summer, it would be nice to convert a simple widget or two to using UI files.
For more info:
https://gjs-guide.gitlab.io/guides/gtk/gtk-tutorial/13-ui.html