Ctrl + Spacebar zoom shortcut goes off if >25 images are open

It would not be normal for me to have 25 document open in Photoshop. I edit in Floating windows  even when using three displays I would not know how I would arrange 20 image windows.   Also for me Ctrl+SpacerBar only seems to be a shortcut for the zoom Tool if the ,mouse cursor is over the active document floating windows. On My machine if the Move tool is the Active tool as soon as the Ctrl Key is pressed and held the move tool option auto-Select option changes state its only when the cursor is over the Active Document and indicating some tools is active like a brush type tool, move tool, pen tool etc will adding  the SpaceBar key cause Photoshop to switch the cursor to the Zoom tool. If the cursor is not over the Active Document the cursor will remain the default system arrow cursor. Ctrl+SpaceBar would not be seen as a Shortcut.  Is you Photoshop cursor over the active document image window when you use Ctrl+SpaceBar?