您需要做的就是将me-auto类添加到取消按钮。
me-auto表示 margin end auto，这与在取消按钮上添加margin-right: auto;具有相同的效果。

<!-- CSS only -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">

<!-- JavaScript Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-kenU1KFdBIe4zVF0s0G1M5b4hcpxyD9F7jL+jjXkk+Q2h455rYXK/7HAuoJl+0I4" crossorigin="anonymous"></script>

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#exampleModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary me-auto" data-bs-dismiss="modal">Cancel</button>
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save</button>
      </div>
    </div>
  </div>
</div>

您可以将Close和保存按钮 Package 在一个div中，然后在modal-footer类中设置一个justify-content: space-between，如下所示：
HTML文件：

<div class="modal-footer">
   <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>

   <div>
      <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
      <button type="button" class="btn btn-primary">Save</button>
   </div>
</div>

CSS文件：

.modal-footer {
  justify-content: space-between;
}