JSFiddle - React, Tailwind, and code Playground

HTML

<select id="select-1">
    <option value="all">Prikazi vse</option>
    <option value="important">Prikazi samo bistvene</option>
</select>
<br>
<input type="text" placeholder="input 1" class="not-important">
<br>
<input type="text" placeholder="input 2" class="not-important">
<br>
<input type="text" placeholder="input 3" class="important">

JavaScript

$('#select-1').on('change', function (e) {
    var val = $(this).val();
    
    if(val === 'important') {
        $('input').hide();
        $('input.important').show();
        return null;
    };
    
    $('input').show();
});