I have found one reference which helps to configure username of polycom vvx phones displayed in all lines.
Check if this helps to fix your issue.
Click Extension / Phones & Numbers / Phones
Note the Presence button. For me, the Presence list is reflected on my Polycom phone. I think this is a good place to help manage the phone's screen.
The earlier advice from Anirban is certainly correct, but for me the Presence screen is a better fix.
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