Use $PSDefaultParameterValues :
$PSDefaultParameterValues['New-Item:Verbose'] = $true
Set the value in the global scope, and then the default value for -Verbose for the New-Item cmdlet will be $ True.
You can use wildcards for cmdlets that you want to influence:
$PSDefaultParameterValues['New-*:Verbose'] = $true
Installs it for all New- * cmdlets.
$PSDefaultParameterValues['*:Verbose'] = $true
install it for all cmdlets.
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