form-check form-check-inline

bootstrap5.css

.form-check-inline {
  display: -ms-inline-flexbox;
  display: inline-flex;
  -ms-flex-align: center;
  align-items: center;
  padding-left: 0;
  margin-right: 0.75rem;
}

bootstrap5.css

.form-check-inline .form-check-input {
  position: static;
  margin-top: 0;
  margin-right: 0.3125rem;
  margin-left: 0;
}

html bootstrap5 Sample

チェックボックスを横並びに変更する：form-check-inline

  <form>
    <!-- form-groupではなく、form-checkを使う -->
    <div class="form-check form-check-inline">
      <input type="checkbox" class="form-check-input" id="checkbox02" value="option1">
      <label class="form-check-label" for="checkbox02">1</label>
    </div>
    <div class="form-check form-check-inline">
      <input type="checkbox" class="form-check-input" id="checkbox03" value="option2">
      <label class="form-check-label" for="checkbox03">2</label>
    </div>
    <div class="form-check form-check-inline">
      <input type="checkbox" class="form-check-input" id="checkbox04" value="option3" disabled>
      <label class="form-check-label" for="checkbox04">3</label>
    </div>
  </form>