Is it a simple way to know under which user I am logging in ?
I know that I can click the properties of the connection. Is it an easier way without clicking?
The simplest is to right-click on the server connection and the click on Properties. This can be done from Perspective.
The other thing you can do is to name the connection based on user. When naming the connection, add the user as part of the name.
When connected it will show user@server. You can setup multiple connections to same host with different user names.
Unfortunately, the login name is not displayed directly. Many people have voted the idea to allow the user to choose a color for his connection. I hope that this idea can be considered soon.