Thank you very much for the quick response! But, unfortunately, this doesn’t yet solve my issue.
There are two different keyboard shortcuts here. First, there’s Cmd+7 for showing and hiding the left panel. I can change or disable it in Preferences / Key Commands / Window / Show Left Panel, but that doesn’t change anything, because Cmd+7 is not the problem.
The problem is the undocumented (?) shortcut Alt+7, which, apparently, puts keyboard focus to the left pane. I cannot find it in the key command editor. I can see that somehow it does exist, because if I try to assign Alt+7 to some other command, it says that it’s already assigned to “UI.SetFocus?Value=kLeftPane”, but UI.SetFocus is not found in the preferences.
And while Finnish is (understandably) not a supported language, German is. Since German Macs also use Alt+7 for the pipe character, I believe they would suffer from this issue as well. Perhaps some German Mac user could try to reproduce this?