Bootstrap class: .form-inline

<form class="form-inline">
  <label class="sr-only" for="inlineFormInputName2">Name</label>
  <input type="text" class="form-control mb-2 mr-sm-2" id="inlineFormInputName2" placeholder="Jane Doe">

  <label class="sr-only" for="inlineFormInputGroupUsername2">Username</label>
  <div class="input-group mb-2 mr-sm-2">
    <div class="input-group-prepend">
      <div class="input-group-text">@</div>
    </div>
    <input type="text" class="form-control" id="inlineFormInputGroupUsername2" placeholder="Username">
  </div>

  <div class="form-check mb-2 mr-sm-2">
    <input class="form-check-input" type="checkbox" id="inlineFormCheck">
    <label class="form-check-label" for="inlineFormCheck">
      Remember me
    </label>
  </div>

  <button type="submit" class="btn btn-primary mb-2">Submit</button>
</form>

Preview

Check .form-inline in a real project

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Tips 💡

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Sass source

/* _forms.scss:262 */
.form-inline {
  display: flex;
  flex-flow: row wrap;
  align-items: center; // Prevent shorter elements from growing to same height as others (e.g., small buttons growing to normal sized button height)

  // Because we use flex, the initial sizing of checkboxes is collapsed and
  // doesn't occupy the full-width (which is what we want for xs grid tier),
  // so we force that here.
  .form-check {
    width: 100%;
  }

  // Kick in the inline
  @include media-breakpoint-up(sm) {
    label {
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 0;
    }

    // Inline-block all the things for "inline"
    .form-group {
      display: flex;
      flex: 0 0 auto;
      flex-flow: row wrap;
      align-items: center;
      margin-bottom: 0;
    }

    // Allow folks to *not* use `.form-group`
    .form-control {
      display: inline-block;
      width: auto; // Prevent labels from stacking above inputs in `.form-group`
      vertical-align: middle;
    }

    // Make static controls behave like regular ones
    .form-control-plaintext {
      display: inline-block;
    }

    .input-group,
    .custom-select {
      width: auto;
    }

    // Remove default margin on radios/checkboxes that were used for stacking, and
    // then undo the floating of radios and checkboxes to match.
    .form-check {
      display: flex;
      align-items: center;
      justify-content: center;
      width: auto;
      padding-left: 0;
    }
    .form-check-input {
      position: relative;
      margin-top: 0;
      margin-right: $form-check-input-margin-x;
      margin-left: 0;
    }

    .custom-control {
      align-items: center;
      justify-content: center;
    }
    .custom-control-label {
      margin-bottom: 0;
    }
  }
}

Uses variables

/* _forms.scss:262 */
$form-check-input-margin-x