diff --git a/src-tauri/src/core_config/settings.rs b/src-tauri/src/core_config/settings.rs
index 3ace3d2..2fcf2ad 100644
--- a/src-tauri/src/core_config/settings.rs
+++ b/src-tauri/src/core_config/settings.rs
@@ -1584,7 +1584,18 @@ pub(crate) fn sanitize_gui_config(config: &mut GuiConfigFile) -> Result<bool, St
         config.routing_session_affinity_ttl = routing_session_affinity_ttl;
         changed = true;
     }
-    let window_size = configured_window_size(config);
+    let window_size = configured_window_size(config).map(|size| {
+        if size.width == LEGACY_DEFAULT_MAIN_WINDOW_WIDTH
+            && size.height == LEGACY_DEFAULT_MAIN_WINDOW_HEIGHT
+        {
+            SavedWindowSize {
+                width: DEFAULT_MAIN_WINDOW_WIDTH,
+                height: DEFAULT_MAIN_WINDOW_HEIGHT,
+            }
+        } else {
+            size
+        }
+    });
     let normalized_width = window_size.map(|size| size.width);
     let normalized_height = window_size.map(|size| size.height);
     if config.window_width != normalized_width || config.window_height != normalized_height {
diff --git a/src-tauri/src/main.rs b/src-tauri/src/main.rs
index 84bc7d4..23bb2bb 100644
--- a/src-tauri/src/main.rs
+++ b/src-tauri/src/main.rs
@@ -124,8 +124,10 @@ const LEGACY_GUI_CONFIG_FILE: &str = "cpa-gui.yaml";
 const MIN_MAIN_WINDOW_WIDTH: u32 = 640;
 const MIN_MAIN_WINDOW_HEIGHT: u32 = 600;
 const MAX_SAVED_WINDOW_DIMENSION: u32 = 16_384;
-const DEFAULT_MAIN_WINDOW_WIDTH: u32 = 1531;
-const DEFAULT_MAIN_WINDOW_HEIGHT: u32 = 891;
+const DEFAULT_MAIN_WINDOW_WIDTH: u32 = 1280;
+const DEFAULT_MAIN_WINDOW_HEIGHT: u32 = 800;
+const LEGACY_DEFAULT_MAIN_WINDOW_WIDTH: u32 = 1531;
+const LEGACY_DEFAULT_MAIN_WINDOW_HEIGHT: u32 = 891;
 const OAUTH_DIR_NAME: &str = "oauth";
 const DEFAULT_AUTH_DIR: &str = "../oauth";
 const DEFAULT_API_KEY: &str = "123456";
diff --git a/src-tauri/src/tests/app_settings.rs b/src-tauri/src/tests/app_settings.rs
index 61dd066..745b8cd 100644
--- a/src-tauri/src/tests/app_settings.rs
+++ b/src-tauri/src/tests/app_settings.rs
@@ -84,8 +84,8 @@ fn gui_config_defaults_are_stable() {
     assert!(content.contains("start-core-on-launch = true"));
     assert!(content.contains("silent-start = false"));
     assert!(content.contains("close-behavior = \"ask\""));
-    assert!(content.contains("window-width = 1531"));
-    assert!(content.contains("window-height = 891"));
+    assert!(content.contains("window-width = 1280"));
+    assert!(content.contains("window-height = 800"));
     assert!(content.contains("auth-dir = \"../oauth\""));
     assert!(content.contains("[[api-keys]]"));
     assert!(content.contains("key = \"123456\""));
@@ -170,6 +170,19 @@ fn gui_window_size_is_clamped_and_requires_both_dimensions() {
     assert_eq!(config.window_height, None);
 }
 
+#[test]
+fn legacy_default_window_size_migrates_to_current_default() {
+    let mut config = GuiConfigFile {
+        window_width: Some(LEGACY_DEFAULT_MAIN_WINDOW_WIDTH),
+        window_height: Some(LEGACY_DEFAULT_MAIN_WINDOW_HEIGHT),
+        ..GuiConfigFile::default()
+    };
+
+    assert!(sanitize_gui_config(&mut config).unwrap());
+    assert_eq!(config.window_width, Some(DEFAULT_MAIN_WINDOW_WIDTH));
+    assert_eq!(config.window_height, Some(DEFAULT_MAIN_WINDOW_HEIGHT));
+}
+
 #[test]
 fn physical_window_size_uses_display_scale_and_ignores_minimized_sizes() {
     let physical_size = tauri::PhysicalSize::new(1500, 1000);
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index 15199f6..9014096 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -13,8 +13,8 @@
       {
         "label": "main",
         "title": "EasyCLIProxyAPI",
-        "width": 1531,
-        "height": 891,
+        "width": 1280,
+        "height": 800,
         "minWidth": 640,
         "minHeight": 600,
         "visible": false
diff --git a/src/pages/UsageRecordsPage.tsx b/src/pages/UsageRecordsPage.tsx
index 1122340..cc2435c 100644
--- a/src/pages/UsageRecordsPage.tsx
+++ b/src/pages/UsageRecordsPage.tsx
@@ -1556,7 +1556,10 @@ function EventsView({
 
       {events.items.length ? (
         <div ref={tableWrapRef} className="usage-table-wrap">
-          <table className="usage-events-table" style={{ width: `${totalTableWidth}px` }}>
+          <table
+            className="usage-events-table"
+            style={{ width: `max(100%, ${totalTableWidth}px)` }}
+          >
             <colgroup>
               {visibleColumns.map((col) => (
                 <col key={col.key} style={{ width: `${widths[col.key]}px` }} />
diff --git a/src/styles.css b/src/styles.css
index a50ad0c..4b1dbaa 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -6617,8 +6617,12 @@ textarea:focus-visible {
 
 .usage-records-page {
   display: grid;
+  width: 100%;
+  max-width: 100%;
+  min-width: 0;
   gap: 12px;
   align-content: start;
+  justify-items: stretch;
 }
 
 .usage-topbar {
@@ -7199,6 +7203,8 @@ textarea:focus-visible {
 /* Events Tab (请求明细) */
 .usage-events-panel {
   display: flex;
+  width: 100%;
+  max-width: 100%;
   min-height: 0;
   padding: 0;
   flex-direction: column;