Copy-Item -ToSession progress bar. How to turn off?

Is there a way to suppress the progress bar that appears when using Copy-Item cmdlet with -ToSession switch? I have my own custom progress bar in script and these blinking pop-up windows are useless and annoying when copying a large amount of small files over PSRemoting session.

Hello, Mark!
There is the $ProgressPreference variable, you can learn more about it in:

Get-Help about_Preference_Variables

So you can do this:

$ProgressPreference = 'SilentlyContinue' # hide the progress bar
# ...your code...
$ProgressPreference = 'Continue' # restore the default value if you need