To sell your fractional shares, you can follow these steps:
Log in to your account.
In the main menu, select the option “Investments.”
Search for the stock you want to sell.
Click on the desired stock to open the details page.
On the stock's details page, select “Sell.”
Choose the option “Sell by number of shares.”
Confirm the order, and you're done!
In this link, you’ll find the various methods currently available to transfer your portfolio from Vest to another broker.