So CtrlShiftL does nothing in Google Docs, where CtrlShiftR and CtrlShiftE work. I tried this on the same google doc but on my Chromebook, and it works. My laptop is Windows 10, so I figured something must have the shortcut of CtrlShiftL on my laptop which overrides the google doc, except nothing happens. Is there any way to solve that?
I had this problem recently and found this question so I will add an answer for others.
I turned out to be a Chrome extension that was overriding the Google Docs hotkey.
I went to chrome://extensions/shortcuts and looked for an entry with
Ctrl + Shift + L and reassigned it to another key. You could also, of course, delete the entry if you do not use the hotkey.