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I am using sql developer version 18.104.22.168. Somehow the connection pane (left side window) disappeared and its not coming back. Can someone suggest solution?
I have tried clicking on View -> Connections but nothing happens.
You can try Windows > Reset Windows to Factory Settings
but if I recall this issue, that doesn't help, sometimes an app restart does.
You might also want to get version 4.1.2 or version 4.1.3 - I haven't seen this behavior for quite some time now.