Interface question

When I open WinSCP how can I see a list of the connections I have defined? This used to be visible on the left side of my screen.

Not sure what "left side" you mean. WinSCP cannot display the connection list on the main window (and it never could).
Maybe you are have turned off Login dialog from automatically popping up on the start?
https://winscp.net/eng/docs/ui_pref_window

See also WinSCP suddenly opens with two local panels with seemingly no option to open a connection to my server. What do I do?.

You are correct, I adjusted those settings, thank you for the help.