In article , says...
There is no "arrow" on the bottom left when switched to W-10 Start menu.
Start and a Task View icon is all that's there.


The "arrow" is the flyout for "show hidden icons"

To enable or disable it...

Right click taskbar.
Select taskbar settings.
In the notification area:
Click "Select which icons appear on the taskbar".

If the first item: Always show etc... is set to on, then you will not
see the flyout.
Select off to show the the flyout, then find
"Windows Explorer Safely remove hardware and eject media"
in the list and turn that on.
The safely remove icon should now be in the flyout or on the taskbar and
you can drag and drop the icon between those two locations.

This works in a totally stock Win 10 installation, if it is not
available on yours, I would look to classic shell or some other
customisation as the culprit.

Please try not to use descriptions such as
"arrow" on the bottom left" as that only applies to your PC

Here is a screengrab of my desktop, can you find the left of the
taskbar?

https://s20.postimg.org/npx6zt9pp/screengrab.jpg