Macbook Laptop screen is blank, external monitor works

After sleep and waking, while the laptop is connected to an external monitor, the main Macbook display goes blank and does not show the screen.

Solution 1: Using the display detection option while seeing the settings on the external monitor reactivates the main display. (go to settings, display, with holding alt/option key, the "Gather Windows" tab changes to "Detect Displays")

Solution 2: Use the apply logo, put the system in sleep mode again and unplug the external monitor from the laptop. Then click any button to come out of sleep mode, and it will turn the main monitor again.

Solution 3. Do the same as solution 2, but completely shut down and turn on the MacBook with the external monitor cable taken out after shut down and if the main display works, connect again.