problem
When the code in front-end page development is very long, it may be necessary to quickly switch to full-screen mode. PyCharm support is not good-worse than the previous Visual Sudio.
I accidentally hid the entire main menu while using it today. As a result, there is no way when you want to redisplay it-and the shortcut key support in Pycharm is limited.
Internet search, the method is as follows:
Step 1: Quickly double-press the left [Shift] key, a search bar will pop up, as shown in the red box in the figure below:
Step 2: Enter the word "View" in the search bar above, and then a large amount of display content will appear, you need to choose carefully:
Step 3: Note that the pop-up window above is very high, use to drag the window up, there is a "...more" option at the bottom (the yellow ellipse is used in the figure).
Step 4: Click this "...more" option to continue to display the following menu items:
Note the following content in the above picture: 
Step 5: Display the "OFF" on the far right, and it will switch to the "ON" state, then the main menu bar of the entire PyCharm IDE is displayed, as shown in the following figure: