I've unticked the "Footer Links" option so that I control exactly where the Switch link appears.
On my desktop theme I've got it displaying fine, but I can't get the widget to appear on the mobile theme.
I've checked that the widget is created in both themes functions.php, and the footer.php has the correct call to display the widget in both as well.
In the "Mobile Widgets" page, I've also activated the correct widget, but the link still won't appear. Why is this?