Actually, in that row of buttons at the top of the View Window is a Render button, an Area Render button and a Tear-Off button. Tear-Off creates a duplicate of what you've just seen rendering.

Counter-intuitively, you click the little 'X' in the upper right hand corner to close it: when it asks whether you want to save it... and you can save it to whichever format you wish.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks