New Joomla! Users Tips & Tricks
I bet they haven’t! Joomla! Admin backend remembers what you last did whilst you are working with it. So, for example, if you were editing an article in one of your specific sections or categories and chose to look for it by using a filter, when you go back to Article Manager it can look as though all the others have disappeared. Just put the filters back to ’select section’ and ’select category’ and you will see them.
The same can happen if you look for plugins and modules in their managers. You might have looked for all modules in the left position, you might have looked for all ‘content’ plugins – just remove the filters and the others will reappear.
Filters are a great way to find what you want quickly – but remembering that you used a filter can save those panic moments when you think everything else has been lost for ever.