Some fields are imbedded into each project but the default is for them to only show in the details view. To be able to see those in the list view, click "hide".

In the "hide" drop down, you can see all of the field options that are shown and hidden within that specific project. To show or unshow a field, toggle the switch next to it.

*This will not remove the field from the project, just from the list view. All of that information will still exist and can be seen in the details side bar.

You can also click "Manage custom fields" from  here to add a field if you don't see what you need.

Click "Close details" once you have finished adding new fields. 

app.asana.com

This guide provides step-by-step instructions on how to access and manage custom fields in Asana. It explains how to show or hide fields in the list view, add new fields, and close details once you're done.