The helper app view displays an app in a pane on the right side of the screen.
Helper apps are applications that appear as an addition to any apps. Therefore, helper apps icons shall be located on the right side of the pane header.
The number of helper apps icon visible shall be set by the user. A down arrow hides/shows the entire helper apps list associated with a pane. Be aware: It is the user (and not the app developer) who choose which helper apps shall be used/displayed.
When users click on a helper app icon, the app opens in a new pane on the right side of the screen.
Only one helper app can be visible at a time. If users select another helper app, the new pane shall replace the one already open.