I Cannot Show The Sidebar On The Finder App

If after rebooting as D.I. Johnson suggests, it doesn't fix the problem, try booting into safemode and then back to normal and see if it works. Safemode runs some system diagnostics and fixes things it finds wrong.

Start up your Mac in safe mode - Apple Support

If that doesn't work, try this:

In Finder, press Command-Shift-G and paste this

~/Library/Preferences/

Delete: com.apple.finder.plist

Finder will create a new clean .plist file when you launch it.

In the View Menu, do you have a Show Toolbar command enabled? Those two are inexplicably linked.

The Hide Toolbar is disabled if you have multiple tabs in the window, but for a single view window, you can hide or show the Toolbar. With the Toolbar hidden, Sidebar gets hidden, too.

As Barney explained: if you hide the toolbar, the sidebar disappears as well.

Note: hiding the toolbar makes Finder windows behave just like traditional "spatial" Finder from "classic" Mac OS: if you double-click on a folder inside such a window, it opens not in the same window, but a new one; and there is a 1-1 correspondence between windows and folders.

Try rebooting the computer?

👍🏽

Mainecoon364 wrote:

@Barney-15E

Strange.

Maybe. I just call it “how it has worked forever.”