php - Initialization of div class with predetermined filter - need syntax assistance

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I have the next code designed for the gallery. Problem is, upon initialization, it puts all the images in.

<div class="portfolio section-padding" data-scroll-index='2'>
  <div class="container-fluid">
    <div class="row">
      <div class="col-lg-12 section-title text-center">
        <h3>Check our recent works</h3>
        <p>We have a variety of activities, including, but not limited to, wine tasting, plating, ethnic food preparation, etc.</p>
        <span class="section-title-line"></span> </div>
      <div class="filtering text-center mb-30">
        <button type="button" data-filter='.brochures' class="active">Courses</button>
        <button type="button" data-filter='.fresh'>Fresh Ansambles</button>
        <button type="button" data-filter='.ethnic'>Ethnic Food</button>
        <button type="button" data-filter='.hands'>Hands-on training</button>
        <button type="button" data-filter='.entree'>Entrees</button>
      </div>
      <div class="gallery no-padding col-lg-12 col-sm-12">
        <div class="col-lg-4 col-sm-6 fresh no-padding">
          <div class="item-img"> <a class="single-image" href="images/gall1.jpeg"></a>
            <div class="part-img"> <img src="images/gall1.jpeg" alt="image">
              <div class="overlay-img">
                <h4>Fresh Ansambles</h4>
                <h6>Fruit platter</h6>
              </div>
            </div>
          </div>
        </div>
        <div class="col-lg-4 col-sm-6 entree no-padding">
          <div class="item-img"> <a class="single-image" href="images/gall2.jpeg"></a>
            <div class="part-img"> <img src="images/gall2.jpeg" alt="image">
              <div class="overlay-img">
                <h4>Entrees</h4>
                <h6>Platter of entrees</h6>
              </div>
            </div>
          </div>
        </div>

Ideally I'd like it to initialize the gallery with data-filter already set to ".brochures". I'm at a loss with the syntax here. Can anyone point me in the right direction?

tried initializing gallery with certain filter set, couldn't