Bypass the limited choices for string options on slashcommand

Hey there, I was looking at some bots and I found a music bot which allows the user to do
/play
name:I'm still
and it suggests in the bar above things (string choices) like
I'm still standing - Elton John
. I thought that command builder choices had a limit of 25.

Anyone any idea how this could've been made so that it suits unlimited options? Or adjusts based on the input
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