Hello Estefania, 

Unfortunately, there isn't such option in Amelia with its current built-in features. There isn't a possibility to show all of the appointments, because of the date picker, the date range needs to be chosen in the panel in order for appointments for those dates to be shown in the appointments list. 

You can try adding this script to the page where you have the Customer panel: 

<script>
window.ameliaBooking = {
    pastEventsDays: 10,
    cabinet: {
        pastDays: 0,
        futureDays: 10,
        disableAuthorizationHeader: false
    }
}

</script>

and for pastDays and futureDays in cabinet set some number of days that you want the appointments to be shown.

And let me know if it helped. 

You are welcome, Estefania

I hope that the script will help out.

If you have any other questions or concerns feel free to open a new ticket and we will gladly help.