You can try this solved your problems:

add_action('admin_head', 'my_admin_custom_styles');
function my_admin_custom_styles() {
    $output_css = '<style type="text/css">
        .column-date { display: none };
        .column-tags { display: none };
        .column-author { width:30px !important; overflow:hidden };
        .column-categories { width:30px !important; overflow:hidden };
        .column-title a { font-size:30px !important };
    </style>';
    echo $output_css;
}

You can try this solved your problems:

add_action('admin_head', 'my_admin_custom_styles');
function my_admin_custom_styles() {
    $output_css = '<style type="text/css">
        .column-date { display: none }
        .column-tags { display: none }
        .column-author { width:30px !important; overflow:hidden }
        .column-categories { width:30px !important; overflow:hidden }
        .column-title a { font-size:30px !important }
    </style>';
    echo $output_css;
}