first add files

ProjectLiaisonForm/pages/navbar/left-title/index.js

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+Component({
+  methods: {
+    onBack() {
+      wx.navigateBack();
+    },
+  },
+});

ProjectLiaisonForm/pages/navbar/left-title/index.json

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+{
+  "component": true,
+  "styleIsolation": "apply-shared",
+  "usingComponents": {
+    "t-navbar": "tdesign-miniprogram/navbar/navbar"
+  }
+}

ProjectLiaisonForm/pages/navbar/left-title/index.wxml

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+<view class="block">
+  <t-navbar t-class-placeholder="t-navbar-placeholder" t-class-content="t-navbar-content" left-arrow title="标题居中" />
+</view>
+
+<t-navbar t-class-placeholder="t-navbar-placeholder" t-class-content="t-navbar-content" left-arrow>
+  <view slot="left" class="custom-title">标题左对齐</view>
+</t-navbar>
+
+<view class="demo-desc">标题尺寸</view>
+
+<t-navbar t-class-placeholder="t-navbar-placeholder" t-class-content="t-navbar-content" left-arrow>
+  <text class="left-text" slot="left" bind:tap="onBack">返回</text>
+</t-navbar>
+<view class="header-title">大标题尺寸</view>

ProjectLiaisonForm/pages/navbar/left-title/index.wxss

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+.custom-title {
+  margin-left: 8px;
+  font-size: 18px;
+  font-weight: 600;
+}
+
+.block {
+  display: block;
+  margin-bottom: 48rpx;
+}
+
+.demo-desc {
+  margin-top: 48rpx;
+  margin-bottom: 32rpx;
+}
+
+.left-text {
+  display: block;
+  margin-left: 4px;
+  font-size: 16px;
+}
+
+.header-title {
+  font-size: 28px;
+  line-height: 36px;
+  padding: 8rpx 32rpx 16rpx;
+  background-color: var(--td-bg-color-container);
+  font-weight: 600;
+  color: var(--td-text-color-primary);
+}