Configure VSCode to launch multiple PowerShell versions (Windows)

settings.json

{
    // Set the default PowerShell engine for VSCode integrated terminal
    "terminal.integrated.shell.windows": "c:/Program Files/PowerShell/6/pwsh.exe",

    // Create Shell Launcher launch options
    "shellLauncher.shells.windows": [
        {
            "shell": "c:\\Program Files\\PowerShell\\6\\pwsh.exe",
            "label": "PowerShell Core"
        },
        {
            "shell": "C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\powershell.exe",
            "label": "PowerShell Desktop"
        }
    ]
}

Shell Launcher VSCode extension
Reference