Shortcut for Keyboard Shortcuts is Ctrl+K while Ctrl+F1 and Ctrl+? seem more common
A lot of GNOME application use Ctrl+F1 and Ctrl+? shortcuts for Keyboard Shortcuts page. Gnome boxes choice for this action is Ctrl+K and a bit unpopular from GNOME applications.
My suggestion is removing Ctrl+K support for Keyboard Shortcuts page and adding Two (more popular) shortcuts for it.
I suggest these shortcuts, due to GTK choice.
* If there is a resource located at "gtk/help-overlay.ui" which
* defines a #GtkShortcutsWindow with ID "help_overlay" then GtkApplication
* associates an instance of this shortcuts window with each
* #GtkApplicationWindow and sets up keyboard accelerators (Control-F1
* and Control-?) to open it. To create a menu item that displays the
* shortcuts window, associate the item with the action win.show-help-overlay.
Source: https://gitlab.gnome.org/GNOME/gtk/blob/master/gtk/gtkapplication.c
Edited by Andre Klapper