SerjiKhoda

 

Make sure you’re pressing the shift key. Option-Cmd-{ is really Option-Cmd-Shift-[

 

This may, or may not, be obvious to all users.  Generally I have observed on the Mac that if SHIFT is required, it is shown in the shortcut key.

Evernote might consider adding SHIFT symbol (⇧) to the shortcuts shown in the menu.

 

I agree, now that I think about it. It's counterintuitive. 

@Adjusting You're right. I'm a fool for not realizing that. Thank you so much!

I can do it through the UI buttons and menu bar options, but shortcuts lead to an error tone on my Mac Pro. 

Incase anyone is wondering, these are the shortcuts: 

⌥ ⌘ { – Align Left