How to Fix Quick Look Preview Not Showing When Pressing Spacebar in macOS

Sometimes you might come across "Quick Look Preview" won't open image when pressing spacebar on an image and here's the solution to fix it.

Step 1: Search Activity Monitor

First search activity monitor from your Apps list

Step 2: Search QuickLookUIService

The next step is to look for this "QuickLookUIService" service, do note that you need to find the one with the keyword "(Finder)".

Step 3: Force Quit Process / Service

Once you have locate it do press the Force Quit to restart the Service.

Final and Preview

Now when you press the spacebar you will be able to see the "Quick Preview" of the image / other files from your finder.