<div class="pb-2">
<table class="table table-bordered">
<tr>
<th class="align-middle text-center list-group-item-action" style="width: auto">AAAAAA</th>
<th class="align-middle text-center list-group-item-action" style="width: auto">BBBBB</th>
<th class="align-middle text-center list-group-item-action" style="width: auto">CCCC</th>
<th class="align-middle text-center list-group-item-action" style="width: auto">DDD</th>
<th class="align-middle text-center list-group-item-action" style="width: auto">EE</th>
<th class="align-middle text-center list-group-item-action" style="width: auto">F</th>
</tr>
<tr>
<td class="align-middle text-center list-group-item-action">aaa</td>
<td class="align-middle text-center list-group-item-action">bbb</td>
<td class="align-middle text-center list-group-item-action">ccc</td>
<td class="align-middle text-center list-group-item-action">ddd</td>
<td class="align-middle text-center list-group-item-action">eee</td>
<td class="align-middle text-center list-group-item-action">fff</td>
</tr>
<tr>
<td class="align-middle text-center list-group-item-action">AAA</td>
<td class="align-middle text-center list-group-item-action">BBB</td>
<td class="align-middle text-center list-group-item-action">CCC</td>
<td class="align-middle text-center list-group-item-action">DDD</td>
<td class="align-middle text-center list-group-item-action">EEE</td>
<td class="align-middle text-center list-group-item-action">FFF</td>
</tr>
<tr>
<td class="align-middle text-center list-group-item-action">第四行</td>
<td class="align-middle text-center list-group-item-action">第四行</td>
<td class="align-middle text-center list-group-item-action">第四行</td>
<td class="align-middle text-center list-group-item-action">第四行</td>
<td class="align-middle text-center list-group-item-action">第四行</td>
<td class="align-middle text-center list-group-item-action">第四行</td>
</tr>
</table>
</div>

<style>
.table td, .table th {
width: 100px; /* 设置为你想要的固定宽度 */
}
</style>