Backend calendar does not resize

I am having an issue on a client’s website where when she goes to edit a day or set of days in her calendar, the options sidebar displays outside of the browser window – the calendar does not resize to accommodate the sidebar.

This is what it looks like on my screen https://i.gyazo.com/972ecf4bbe637ba16896b58f99891101.png As you can see, the sidebar is cut off and there is no way to even scroll across to see it all. On my clients screen with the browser full size, she doesn’t see see the sidebar at all, thus she has no way of editing her calendar days.

This seems to be a recent problem as we have been using the plugin for quite a while now without any issue.

Thanks
Colin