add this code in your wplms-customizer.php file in wplms customizer plugin :
add_action('admin_head', 'my_custom_fonts');
function my_custom_fonts() {
echo '<style>
@font-face {
font-family: eicons;
src: url(https://ixiredu.com/wp-content/plugins/elementor/assets/lib/eicons/fonts/eicons.eot);
src: url(https://ixiredu.com/wp-content/plugins/elementor/assets/lib/eicons/fonts/eicons.eot) format("embedded-opentype"),url(https://ixiredu.com/wp-content/plugins/elementor/assets/lib/eicons/fonts/eicons.woff2) format("woff2"),url(https://ixiredu.com/wp-content/plugins/elementor/assets/lib/eicons/fonts/eicons.woff?5.12.0) format("woff"),url(../fonts/eicons.ttf?5.12.0) format("truetype"),url(../fonts/eicons.svg?5.12.0#eicon) format("svg");
font-weight: 400;
font-style: normal
}
</style>';
}