RT::Extension::ToggleSuperUser Link not accessable

Having problems with this plugin - the link to toggle supper user mode is visible but behind the home page menu option so can’t be clicked on. Seems to happen in both chrome and firefox. Any idea what is causing this?

That extension is an “unofficial” one and looks like it hasn’t been updated in a while so it may not work with newer versions of RT any longer. I haven’t used it before though