The feature is: The colour of submission status of summary represent what kind of language the person use.
I'm very depressed to know it so lately...
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me also don't know it before your post :(
And you can actually configure it in your Arena settings. I think default setup assigns the same color to several languages, which I find misleading.
What about pretty (radio)button ? After near 50 contests i don't know what does it do. When i click on or off nothing changes.
I have always wondered what the buttons are for as well.
"The TopCoder Arena has code-beautification functionality built in for those that wish to use it. In the Room Summary Window, setting Pretty to On in the upper-right corner will cause subsequent source code view to incorporate basic code formatting rules. For some languages and some submissions, the Pretty option will have no effect." — https://community.topcoder.com/tc?module=Static&d1=help&d2=roomSummary
As of now this button has no effect
We can color status of standing by used programming language in Codeforces too. This tool is available here