diff --git a/README.md b/README.md
index 1417504..86ba4f1 100644
--- a/README.md
+++ b/README.md
@@ -12,3 +12,4 @@ TODO
   - [x] 保存历史
   - [x] 自动接收
   - [ ] 传输加密
+- [ ] 单例模式
\ No newline at end of file
diff --git a/frontend/src/components/TransferItem.vue b/frontend/src/components/TransferItem.vue
index 7b253e5..92c9f1e 100644
--- a/frontend/src/components/TransferItem.vue
+++ b/frontend/src/components/TransferItem.vue
@@ -263,35 +263,49 @@ const canAccept = computed(() => {
               color="success"
               icon="mdi-content-save"
               @click="acceptTransfer"
-            ></v-btn>
+            >
+              <v-tooltip activator="parent" location="top">Accept</v-tooltip>
+            </v-btn>
 
             <v-btn
               v-if="canAccept"
               color="success"
               icon="mdi-folder-arrow-right"
               @click="acceptToFolder"
-            ></v-btn>
+            >
+              <v-tooltip activator="parent" location="top">
+                Save to Folder
+              </v-tooltip>
+            </v-btn>
 
             <v-btn
               v-if="canAccept"
               color="error"
               icon="mdi-close"
               @click="rejectTransfer"
-            ></v-btn>
+            >
+              <v-tooltip activator="parent" location="top">Reject</v-tooltip>
+            </v-btn>
 
             <v-btn
               v-if="canCopy"
               color="success"
               icon="mdi-eye"
               @click="showContentDialog = true"
-            ></v-btn>
+            >
+              <v-tooltip activator="parent" location="top">
+                View Content
+              </v-tooltip>
+            </v-btn>
 
             <v-btn
               v-if="canCopy"
               color="success"
               icon="mdi-content-copy"
               @click="handleCopy"
-            ></v-btn>
+            >
+              <v-tooltip activator="parent" location="top">Copy</v-tooltip>
+            </v-btn>
 
             <v-btn
               v-if="
@@ -303,14 +317,18 @@ const canAccept = computed(() => {
               color="info"
               icon="mdi-delete"
               @click="handleDelete"
-            ></v-btn>
+            >
+              <v-tooltip activator="parent" location="top">Delete</v-tooltip>
+            </v-btn>
 
             <v-btn
               v-if="canCancel"
               color="error"
               icon="mdi-stop"
               @click="CancelTransfer(props.transfer.id)"
-            ></v-btn>
+            >
+              <v-tooltip activator="parent" location="top">Cancel</v-tooltip>
+            </v-btn>
           </v-btn-group>
         </div>
       </div>
diff --git a/internal/config/config.go b/internal/config/config.go
index 8793378..e29ebdb 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -77,6 +77,7 @@ func Load() *Config {
 	}
 	v.SetDefault("host_name", defaultHostName)
 	v.SetDefault("id", uuid.New().String())
+	v.SetDefault("save_history", true)
 
 	v.SetConfigFile(configFile)
 	v.SetConfigType("json")
@@ -182,3 +183,16 @@ func (c *Config) GetSaveHistory() bool {
 func (c *Config) GetVersion() string {
 	return Version
 }
+
+func (c *Config) SetWindowState(state WindowState) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.WindowState = state
+	c.v.Set("window_state", state)
+}
+
+func (c *Config) GetWindowState() WindowState {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return c.WindowState
+}
diff --git a/internal/transfer/history.go b/internal/transfer/history.go
index e1e7f93..cbd8486 100644
--- a/internal/transfer/history.go
+++ b/internal/transfer/history.go
@@ -15,7 +15,7 @@ func (s *Service) SaveHistory() {
 	if err != nil {
 		return
 	}
-	file, err := os.OpenFile(historyPath, os.O_CREATE|os.O_RDWR, os.FileMode(0644))
+	file, err := os.OpenFile(historyPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
 	if err != nil {
 		return
 	}
diff --git a/internal/transfer/service.go b/internal/transfer/service.go
index 6436335..e1ca57a 100644
--- a/internal/transfer/service.go
+++ b/internal/transfer/service.go
@@ -65,7 +65,7 @@ func (s *Service) Start() {
 }
 
 func (s *Service) GetTransferList() []*Transfer {
-	var requests []*Transfer
+	var requests []*Transfer = make([]*Transfer, 0)
 	s.transferList.Range(func(key, value any) bool {
 		requests = append(requests, value.(*Transfer))
 		return true
diff --git a/main.go b/main.go
index 6755448..112a04a 100644
--- a/main.go
+++ b/main.go
@@ -81,20 +81,25 @@ func main() {
 
 	// 窗口关闭事件
 	window.OnWindowEvent(events.Common.WindowClosing, func(event *application.WindowEvent) {
-		// 保存配置
 		x, y := window.Position()
 		width, height := window.Size()
-		conf.WindowState = config.WindowState{
+		conf.SetWindowState(config.WindowState{
 			X:      x,
 			Y:      y,
 			Width:  width,
 			Height: height,
-		}
-		_ = conf.Save()
+		})
+
 		// 保存传输历史
 		if conf.GetSaveHistory() {
 			transferService.SaveHistory()
 		}
+
+		// 保存配置
+		err := conf.Save()
+		if err != nil {
+			slog.Error("Failed to save config", "error", err)
+		}
 	})
 
 	application.RegisterEvent[FilesDroppedEvent]("files-dropped")