When you open at the Samsung Galaxy S5 a particular document, URL or file, then you might be asked whether this element is to be opened by default with always the same app. If you have here, tapped on the button "Always", then this element will now always be opened on your Samsung Galaxy S5 with the same application.
Now, however, it may be that you want to make this default application setting reverse. If that's the case, then we would like to show you here how you can undo on the Samsung Galaxy S5 and Android Lollipop the default application for a specific element.
For this proceed as follows:
Menu --> Settings --> Section "Applications" --> Default Applications
You now see a list in which all the default values that were set by you can be found. In order to remove an app that was set as the default from the list, tap once on the "Delete" button. Finished!
You now know how to undo the selection of a default Apps for items such as documents, web addresses or files.