A normal Finder window used to open when I pressed Option + Command + Spacebar but not its a Search window. I know this happened once and I found how to fix it but I can't find it anymore.
I found a solution to the issue. OptCmdSpace has always been a command for showing a "finder search window". If you now just see a window without the sidebar just do this:
- press OptCmdSpace To open this window
- Press OptCmdT or go to "view>hide toolbar".
Sometimes we just press it accidentally and this hides the toolbar, which makes this searching window into a "normal finder window".