There is an option in KeePass - "Focus Entry List after a Successful Quick Search". It would be nice to have the same option for the tags system. So, you click the "Show Entries" button on the KeePass toolbar, which brings up a drop-down list. At the bottom of this list, are the tags you have used for various entries. When you click one of these, everything except for the entries with that tag is filtered out. However, the entry list does not have focus. You have to mouse click on it yourself.