As stated in the Title, it is easier said than done to change the default landing page of a Document Center. If you have done publishing sites often, you will usually go to “Welcome Page” in the site setting page to do it.
But in Document Center site, this feature is missing and what’s even worse, that there is no Pages or Site Pages library for you to set the homepage
[I’m referring to the set homepage feature below]
So how to change the default landing page for SharePoint Document Center?
The trick is simple, all you need to do is to go to the Document Library that you want to make default home page.
Hit on the “Edit Page” menu under Site Action gear.
Once the Document Library page is in Edit Mode, you shall see additional Ribbon Tabs appear and shown below, Go to “Pages” tabs and now you can set the HOME PAGE! (hidden gem)
There are alternative ways of doing this such as running PowerShell etc. but I personally find this the quickest and easiest way to do it.
Hope it helps!