The solution to the problem that the external projector cannot display in full screen after installing WIN10 on the laptop

Steps

1. Right click on the desktop -> select display properties -> select advanced display settings
2. Set the resolution to be the same as the projection resolution (1024*768)
   
   3. Click the Intel HD Graphics icon in the lower right corner -> select Graphics Options -> Select Screen Fit -> Select Monitor -> Select Keep Display Scaling Ratio
   
   Note
   When setting the resolution, the resolution of the notebook must be the same as the resolution of the projector.