The output window always shows what your active camera is currently
viewing. If you want to cancel the render at any time, press the ESC key.
It may take a while to stop your rendering, especially in Cycles, but it will
eventually stop.
6.4 Saving a render
How to save your renders from the Output window in Blender? After
having your render results showing in the Output window, use the Image
menu to save it as an image file. Look for the "Save as…" to save a
render (Figure 6.11).
Figure 6.11 - Image menu
A new window appears where it is possible to choose a location to save
your render and also an image format. Here are the available options: