Fixed ver. of https://gist.github.com/xirtardauq/04d8b8b7a75c63c3955b0d326114c26c

show-form-data.ps1

function Get-FormData($formId, $startDate, $endDate) {
    $provider = [Sitecore.DependencyInjection.ServiceLocator]::ServiceProvider.GetService([Sitecore.ExperienceForms.Data.IFormDataProvider])
    $entries = $provider.GetEntries($formId.Guid, $startDate, $endDate)
    if (-not $entries) {
        return $null
    }
    
    # Get all column title
    $titles = new-object System.Collections.Generic.HashSet[string]
    $entries | % { $_.Fields | % { $titles.Add($_.FieldName) > $null } }

    # Make rows from the entries
    $entries | % { ConvertTo-Row $_ $titles }
}

function ConvertTo-Row($entry, $titles) {
    $row = [PSCustomObject]@{}
    $titles | % {
        $field = $entry.Fields | ? FieldName -eq $_ | select -First 1
        $value = $field.Value -replace [Environment]::NewLine,"<br>" # replace newlines to br tag
        $row | Add-Member -MemberType NoteProperty -Name $_ -Value $value
    }
    $row | Add-Member -MemberType NoteProperty -Name Created -Value $entry.Created
    $row
}

$result = Read-Variable -Parameters `
  @{Name='formItem'; Title='Form'; Editor='droptree'; Source="DataSource=/sitecore/Forms"},
  @{Name='startDate'; Title='Start date'; Editor='date'},
  @{Name='endDate'; Title='End date'; Editor='date'}

if ($result -ne "ok") {
    exit
}

Get-FormData $formItem.ID $startDate $endDate |  Show-ListView