Every once in a while, newly pinned extension is not showing in the title bar. it does show in the toolbar, which is hidden.
to make it worse, it is also hidden in customization page, so it's impossible to move it in any way. also, because it weirdly requires long press to show the extensions, it's then impossible to trigger on the touchscreen.
closing all the instances will help, but, why not show the the address bar along with the toolbar in the customization page?