When Gnome menu is expanded, we can't take screenshot by just pressing PrntScn Key of our keyboard. We need some other solution to do this.
So here I am writing two methods which you can be used to take a screenshot with expanded Gnome Menu.
You can run gnome-screenshot on a timer. For example:
$gnome-panel-screenshot --delay 5
In this method, you need to use gimp image editor.
To take a screenshot, open
file -> create ->screenshot
Choose Take Screenshot of entire screen and choose suitable time in seconds too. Gimp will take screenshot after that specific time.