If you find that the Desktop Aero Peek feature is not working in your Windows 10/8/7 even after you have enabled it through the Control Panel, or through the Taskbar & Start Menu Properties box, it is quite possible that you may have tweaked your visual settings, as a result of which your Aero Peek too may have got inadvertently disabled.
Desktop Aero Peek not working
Perhaps this may help you:
Open Control Panel > Performance Information and Tools > Adjust Visual Effects.
Ensure that the Enable Aero Peek box is checked.
Also ensure that:
- Enable desktop composition &
- Use visual styles on windows and buttons
is checked. Clicked Apply > OK.
Better still, select Let Windows choose what’s best for my computer and click Apply/OK.
You could also copy-paste the following command in the CMD window, and hit Enter.
This will flush the Aero cache. Even if you find that your Flid3D is not working or disabled, you may try this.
If nothig helps, maybe your Desktop Manager Session Manager Service and the Desktop Window Manager has been disabled. Open Service Manager and check.
In such a case you may want to see this post on How to troubleshoot & Fix Aero issues in Windows.