[Feature]: UI界面问题

### Problem or Motivation 再听课的时候无法沉浸式观看PPT，讨论那个模块能不能隐藏？或者可以做成弹幕啊 ### Proposed Solution 关于讨论这块可以隐藏 ### Alternatives Considered _No response_ ### Area Classroom generation ### Additional Context _No response_