第一步：file->settings->Appearance&Behavior->Appearance. 第二步：在右邊window options下選擇 show tool bar windows 第三步：Apply 完成 Intellij IDEA顯示左右的maven projects
![Maven 問題 Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.12.4 的處理[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)