How can I disable QuickLook

This is technically not a new question. I asked it nearly a year ago and got no satisfactory response. I find that when I waken my iMac from sleep by pressing the space bar it highlights an apparently random icon on the desktop. Then, if I hit the space bar again QuickLook does its thing and that folder or document expands in the middle of the screen. How can I either disable QuickLook completely or, failing that, either disable the random highlighting feature or switch the function that activates it from the space bar to a more obscure key that I won't be pressing by accident? And please, no one tell me that I should waken the computer by depressing a key other than the space bar. That is not a solution, it's a capitulation.

Roger,
I find that when I waken my iMac from sleep by pressing the space bar it highlights an apparently random icon on the desktop. Then, if I hit the space bar again QuickLook does its thing and that folder or document expands in the middle of the screen.
Hitting the space bar once should only awaken your computer.
It's more likely that the icon had already been selected when your computer went to sleep. If an icon is selected on the Desktop, hitting the space bar will open Quick Look as you describe.
I think what you may be doing is tapping your space key two or more times to wake the computer.
One tap is sufficient to wake the computer. Subsequent taps will either select an icon or open Quick Look for any icon already selected.
And please, no one tell me that I should waken the computer by depressing a key other than the space bar.
I won't tell you that. But I will tell you to not press the space key more than once to wake the computer.
Matt

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