There is no "OK" button in settings window in "gnome-shell-extension-islamic-datetime"

Assalamo alaykom,

As you can see in attachment, there is no "OK" button to validate values in settings window, and so when I put any value in the first three fields and then close directly the settings window and then open it again I find the old values (default ones are only 0), the solution I find to make it working is to press "return" button on my keyboard on each field after setting the new value! that works for me like that but it should improved.