Customizing the Backend in Appointments


I need help with a few things, in rather a short period, with little knowledge of Wordpress haha.

1) In the back end of Appointments, where I can filter by status and see line items of my appointments. Can I change what I can see from this view?
Right now it has Appointment Date, Client, Service ect.
I have added a custom field, can I add this field so I can filter by it?

2) I used code provided in this forum to add a Custom "Status", which worked in the fact that the custom status appeared in the dropdown, however I changed some appts to this status and they just disappeared. There are there when I export, but i need to see them in the back end so I can delete them.

Please help!

Thank you!
Thank you!