Some of the keyboard shortcuts are inaccessible on non-US keyboard layouts. For example on German and Nordic keyboard layouts it is impossible to perform "Shift + ~" keyboard shortcut to open control center. Because Kagi also overrides tab key behavior by default, this means users that are unable to use a pointing device are left with no way to access settings (which would be required in order to disable keyboard shortcuts). I think it would be better to not restrict which elements are accessible through tab key, since that is the standard way to navigate through keyboard. You could still focus the first result by default so it wouldn't affect current behavior much, just make it possible to get to elements outside the results too.
The keyboard shortcut for focusing the search bar ("/") is also rather inconvenient (Shift+7, which requires two hands to type) on this layout, so it would be nice to be able to rebind it.