Customize Template

1: General

a) But Ticket at

• Hide "Internal link" option: Add bellow code to functions.php file in child theme

add_filter( 'el_show_ticket_internal_link_field', '__return_false' );

• Hide "External Link" options: Add bellow code to functions.php file in child theme

add_filter( 'el_show_ticket_external_link_field', '__return_false' );

• Setup "External link" option is Default Add bellow code to functions.php file in child theme

add_filter( 'el_ticket_link_default', function(){ return  'ticket_external_link'; } );

• Hide Internal link and External link option

add_filter( 'el_show_ticket_link_opt', '__return_false' );

b) Type

• Hide "No Seat" option Add bellow code to functions.php file in child theme

add_filter( 'el_show_ticket_type_no_seat', '__return_false' );

• Hide "Simple Seat" option Add bellow code to functions.php file in child theme

add_filter( 'el_show_ticket_type_simple', '__return_false' );

• Hide "Map" option Add bellow code to functions.php file in child theme

add_filter( 'el_show_ticket_type_map', '__return_false' );

• Setup "Simple Seat" option is Default Add bellow code to functions.php file in child theme

add_filter( 'el_ticket_type_default', function(){ return 'simple'; } );

• Setup "Map" option is Default

add_filter( 'el_ticket_type_default', function(){ return 'map'; } );

2: Customzie Template in child theme

Without use some above filter hook, you can customize template in child theme:

Copy file 
wp-content/plugins/eventlist/templates/vendor/__edit-event-ticket.php 
to
wp-content/themes/meup-child/eventlist/vendor/__edit-event-ticket.php
and edit code in that file