I'm not sure what you mean by "Login sequence". Can you post a screenshot showing what exactly do you want to rename?

I don't see anything like "changing workspace name" in Login sequence. In fact, I don't even see a "Login Sequence". It simply opens in my User directory.

As for the next suggestion, I don't see any "Preferences" either! Are you thinking of WinSCP?

Just rename the workspace on the Login dialog:
https://winscp.net/eng/docs/ui_login#renaming

You might also need to change the name of the default workspace in Preferences:
https://winscp.net/eng/docs/ui_pref_window

How do we change a Workspace name? The old names of older user Workspaces are confusing and could be updated. How is this done?