Screenshot gallery
To create a gallery of screenshots in a single image file:
Press the menu button in the top-right corner of the window and select Create Screenshot Gallery….
In the dialog, enter a name for the gallery file to be created.
Optionally, change the folder into which the gallery will be saved.
Click Save when ready.
A progress bar will be shown while the screenshots are taken. The gallery will be saved as a .jpg file.
On the bottom of the dialog you may specify the width of screenshots in pixels. You may also set the number of screenshots that the gallery will include or tick option Calculate the number of screenshots and Videos will set it automatically.