Great! But I believe that’s I think because Windows Terminal got “modernized” to use ancient Unix tech. 
If you want to support older Windows or just not with Windows Terminal, that may not apply. But going to the shell, i.e.:
julia> run(`cls`)
should always run on Windows (but not on Linux, why it would help for Juliato add it as a cross-platform option), even in PowerShell: Clear-Host (Microsoft.PowerShell.Core) - PowerShell | Microsoft Docs