Windows 10: How to recover "show hidden icons" carrot icon in taskbar

Windows 10's Tablet Mode provides a more touch-friendly experience by  making all applications run at full screen (rather than in windows) and giving you a Start screen instead of a Start Menu. If you have a 2-in-1 device, Windows 10 asks you if you want to enter tablet mode every time you convert your notebook into a slate.

"Show hidden icons" is not visible in Windows Taskbar. Enabling Tablet mode removes "show hidden icons" from Widows Taskbar. Disabling Tablet mode restores "show hidden icons."

Step-by-Step

Toggle tablet mode on or off

1. Tablet mode makes Windows 10 more touch-friendly when using your device as a tablet. Select-action center  on the taskbar (next to the date and time), and then select Tablet mode to turn it on or off.

Turning tablet mode off

1. Click Settings on the Start Menu
2. Select System.
3. Select Tablet mode in the left pane. A Tablet mode submenu appears.
4. Toggle "Make Windows more touch-friendly . . ." to on to enable Tablet mode. Toggle it off to go to desktop mode. 
5. Select "Don't ask me and always switch" from the "When this device automatically switches" menu if you want Windows 10 to switch modes on your 2-in-1 without prompting you.