Simple and small !
Admin Disabled Products Marker for OpenCart highlights the disabled products on admin products list page – it’s all what this extension does.
Will be useful if you have a big amount of products with frequently changing status.
You need an vQmod extension to install this plugin. You can get it HERE.
Just copy an xml file to vQmod xml folder.
If something goes wrong – you can rename this file like .xml~ (it will disable plugin) and then contact me with your issue.