EE3 hide admin columns

<?php
/**
 * Plugin Name:       Just a Custom Functions Plugin
 * Plugin URI:
 * Description:       for custom functions
 * Version:           1.0.0
 * Author:            Dean Robinson
 */




function load_the_admin_css_mods() {

//var_dump($_GET);
if( !isset($_GET['event_admin_reports']) ) {  }
else {
?>

<style>
@media only screen and (max-width : 786px) {

/*#event_reg_theme table thead tr th:nth-child(1),*/
#event_reg_theme table thead tr th:nth-child(3),
#event_reg_theme table thead tr th:nth-child(4),
#event_reg_theme table thead tr th:nth-child(5),
#event_reg_theme table thead tr th:nth-child(7),
#event_reg_theme table thead tr th:nth-child(9),
#event_reg_theme table thead tr th:nth-child(10) {
    display: none;
}

/*#event_reg_theme table tbody tr td:nth-child(1),*/
#event_reg_theme table tbody tr td:nth-child(3),
#event_reg_theme table tbody tr td:nth-child(4),
#event_reg_theme table tbody tr td:nth-child(5),
#event_reg_theme table tbody tr td:nth-child(7),
#event_reg_theme table tbody tr td:nth-child(9),
#event_reg_theme table tbody tr td:nth-child(10) {
    display: none;
}


#event_reg_theme form table thead tr th:nth-child(1),
#event_reg_theme form table tbody tr td:nth-child(1) {
width: 15% !important;
}

#event_reg_theme form table thead tr th:nth-child(2),
#event_reg_theme form table tbody tr td:nth-child(2) {
width: 40% !important;
}

#event_reg_theme form table thead tr th:nth-child(6),
#event_reg_theme form table tbody tr td:nth-child(6) {
width: 25% !important;
}

#event_reg_theme form table thead tr th:nth-child(8),
#event_reg_theme form table tbody tr td:nth-child(8) {
width: 20% !important;
display:table-cell;
overflow:visible;
 }

}
</style>

<?php
}

}

add_action('admin_head','load_the_admin_css_mods');