Is your feature request related to a problem? Please describe.
Adw (libadwaita) is the GUI library for modern GNOME applications in GNOME 42. Customize IBus preference panel on GNOME 42 still uses GTK widgets ScrolledWindow, which now faces scrolling issues as well as header bar issues, causes great distraction.

Describe the solution you'd like
GUI port to Adw (libadwaita) for GNOME 42, and also consider backward compatibility for legacy GTK which doesn't have Adw (In short, two GUIs, one for GNOME 42 and above).

Describe alternatives you've considered
Or changes so that the GTK.notebook can scroll up and down properly when mouse hovers. As well as fix the header bars on GNOME 42 to make it just look like those less than GNOME 42.

Additional context
Hope someone can help with this issue, as the maintainer is currently busy with their graduation dissertation and doesn't have any time for this issue.