At the tiddler here, the link “Here are some suggestions” appears to be broken.
Given the topic of the tiddler it’s possible that it’s intentional, but if not, humorously ironic 
I submitted a documentation update
FYI, a tiny typo on the http://tiddlywiki.com documentation page “StartupActions”: the text says “when the screen width is less than 1000 pixels” but the code says “state=”$:/info/browser/screen/width" text=“3000”
I wonder which way the error went – in the text or in the example. I’m guessing in the example. 3000 pixels would mean no sidebar all the time for most people.