The wording is such that it doesn't have "sell for cash" or "cash out" language so the hoi polloi with room temperature IQ can't figure it out without paid guidance. Instead it asks you to go to click on your account, transact, (assuming you have e.g. VOO) trade ETFs and stocks, cross reference your securities of choice by typing them in (you have to look up their code from the Holdings tab and note it down or remember it), put in how many shares, or calculate how many dollars worth you need. Finally, there are four scary looking sell order types with no default. You have to actually understand what each means to determine if you want it.
Its probably for the best.
Allegedly the new website is coming https://investor.vanguard.com/new-vanguard-experience