If you have the latest version of InDesign CC 2015.2, you can disable the Startup Workspace by choosing Preferences > General and unchecking "Show Start Workspace..."
Unless there is a method provided for Enterprise or Volume customers, I don't think there's a "official" way turn off the CC Libraries.
Thanks for the response, Steve. The corporate build has me at CC2015.0 – any options for this version?
You really need to get them to upgrade you to CC 2015.2. It fixes a lot of bugs.
But in the meantime, if you see the Welcome Screen, scroll down and you should see a "Don't Show Again" option you can check.
Is 2015.2 otherwise completely compatible with 2015.0? Lots of file sharing here.
As I mentioned in the original post, "My welcome screen doesn't function – the panes where the 'Disable Welcome' is found do not load content. Instead, they display images of unhappy looking dogs and complain about no internet access."
Yes, 2015.2 is compatible with 2015.0.
The Welcome Screen (in 2015.0) depended on Internet connection which cause problems for a lot of people like you. But the only way to turn it off was to uncheck the checkbox (as far as I know).
Using the checkbox to turn off the welcome screen is fine... until InDesign crashes (or the OS crashes, blackout etc...) and then it comes back on the next launch.
app.generalPreferences.showWhatsNewOnStartup = false;
Copy the line of text above into a simple text editor, save it using any name you choose with .jsx at the end (I use nomorestartup.jsx) and put it into the "startup scripts" folder.
So far as the CC libraries, not so sure...
CC Libraries is a lot more complex because it's fully integrated into InDesign, has its own process running on your computer, etc. No easy way to turn that off that I've heard of.
I love it when I learn something new and awesome. I didn't realize you could do startup scripts for ID!
(For those wondering, just make a folder called "Startup Scripts" in your Scripts folder, per Marc Autret's comments in this thread.)