On a multi-monitor computer setup, the visibility of shortcut arrows are ignored. This happens regardless of the shortcut arrows preference chosen within Fences.
Only on the primary monitor is the shortcut arrow preferences always respected. On any other secondary monitor, the shortcut arrows are hidden after a desktop refresh or computer restart.
This can easily be reproduced by populating a Fence with shortcuts on a secondary monitor. Right-click to refresh the desktop and the shortcut arrows will now be hidden. Then drag this particular Fence to the primary monitor and suddenly the shortcut arrows will be visible. This is all done with a normal Fence, not a Folder Portal.
Windows 10 - Build 17134