The article describes how to set the default landing page in x1 / 3.x on StoreFront 3.x.
 

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Instructions

To set a landing folder for Receiver with the new Unified Receiver UI, simply add the following code snippet to script.js under the custom folder:

var landingFolder = “Microsoft\\Office\\2013″ ; CTXS.Extensions.afterDisplayHomeScreen = function () { CTXS.ExtensionAPI.changeView(“store” ); CTXS.ExtensionAPI.navigateToFolder(landingFolder); };

Change the value of landingFolder appropriately.

For SF 2.6 - http://blogs.citrix.com/2015/05/11/setting-a-default-landing-folder-for-receiver-for-web/#comment-176306