@d-east ,
Interesting, I did lots of experimenting after someone mentioned sessions to me, and found the following sequence:
Only one instance open of Notepad++ Open change.log and license.txt (closing anything else first) File > Save Session… => main.sess File > Close All Settings > Preferences > Multi-Instance & Date > Multi-Instance = Open Session in new instance View > Document List turned on Open readme.txt Exit Notepad++ and restart At this point, the Document List is still visible File > Load Session… => pick main.sess It opens change.log and license.txt in a second Notepad++ instance, but this instance does not have Document List visible Exit the second instance of Notepad++ Exit the first instance of Notepad++ Restart Notepad++ to prove that Document List is still visible, which proves that the setting is still in effectThis confirms your issue.
I was going to point you to the FAQ for where to submit bug reports, but it turns out issue #9710 already shows a report of the same issue: “Document List panel is not shown when new instance is run”.