I use cmd + alt + spacebar to launch a new finder window on my mac. Sometimes however, instead of launching a normal finder window complete with sidebar (something like this), it instead launches a window without a sidebar, like this . Why does this happen and how do I prevent it from happening?
On my computer, ⌘⌥+T toggles the toolbars on/off.
Maybe you have this keyboard shortcut set to ⌘⌥ +
C, such that you accidentally hit both shortcuts?
You can check in your
SysPrefs > Keyboard > Shortcuts pane, or just try those shortcuts that are near the space bar.
I suggest this because of your assertion that it happens "sometimes", which is pretty weird. I did once have my toolbars always missing, which it turns out required some preference file to be deleted or something. But I've never seen an intermittent issue like that.