I'm not a Max expert, but this issue seems to be related to the Workspace feature ( https://knowledge.autodesk.com/suppo...5E5F3-htm.html )
I found the Vantage toolbar in %LOCALAPPDATA%\Autodesk\3dsMax\2021 - 64bit\ENU\en-US\UI\MaxStartUI.cuix as well as in another .cuix file in the Workspaces subfolder. I suspect your 3ds Max is configured to default to a workspace that doesn't include this toolbar and it's a matter of changing Workspace settings.
I found the Vantage toolbar in %LOCALAPPDATA%\Autodesk\3dsMax\2021 - 64bit\ENU\en-US\UI\MaxStartUI.cuix as well as in another .cuix file in the Workspaces subfolder. I suspect your 3ds Max is configured to default to a workspace that doesn't include this toolbar and it's a matter of changing Workspace settings.
Comment