The full signature for showing a Cordova InAppBrowser is showURL(url,targetWindow,properties). The valid properties are shown in the example below. This example enables a toolbar with all options. Tweak it to enable/disable the properties you need.
phoneui.showURL('http://genuitec.com', '_blank',
{showLocationBar: true,
showAddress: true,
showNavigationBar: true,
patchWindowClose: true })