The SharePoint Admin Center provides various governance features, but there is no way to easily remove all entries from the Tenant Wide Extensions list exist in the Tenant App Catalog Site from the SharePoint admin center for governance activities. This sample script shows how to do this and exports the deleted entries in a comma-separated values (CSV) file for reference.

Prerequisites

PowerShell Script

$resultDir = "Output"
$listName = "Tenant Wide Extensions"
$fields = "Id, Title, Modified, Created, AuthorId, EditorId, TenantWideExtensionComponentId, TenantWideExtensionComponentProperties, TenantWideExtensionListTemplate, TenantWideExtensionWebTemplate, TenantWideExtensionSequence, TenantWideExtensionHostProperties, TenantWideExtensionLocation, TenantWideExtensionDisabled"

$executionDir = $PSScriptRoot
$outputDir = "$executionDir/$resultDir"
$outputFilePath = "$outputDir/$(get-date -f yyyyMMdd-HHmmss)-deletedtenantwideextensions.csv"

if (-not (Test-Path -Path "$outputDir" -PathType Container)) {
    Write-Host "Creating $outputDir folder..."
    New-Item -ItemType Directory -Path "$outputDir"
}

$appCatalogUrl = m365 spo tenant appcatalogurl get

if ($appCatalogUrl) {
    $spolItems = m365 spo listitem list --title $listName --webUrl $appCatalogUrl --fields $fields  -o json | ConvertFrom-Json -AsHashtable

    if ($spolItems.Count -gt 0) {
        $deletedSpfxExtensionConfigs = @()

        foreach ($spolItem in $spolItems) {
            $author = m365 spo user get --webUrl $appCatalogUrl --id $spolItem.AuthorId -o json | ConvertFrom-Json
            $editor = m365 spo user get --webUrl $appCatalogUrl --id $spolItem.EditorId -o json | ConvertFrom-Json

            $configurationObject = New-Object -TypeName PSObject

            $configurationObject | Add-Member -MemberType NoteProperty -Name "Id" -Value $spolItem.Id
            $configurationObject | Add-Member -MemberType NoteProperty -Name "Title" -Value $spolItem.Title
            $configurationObject | Add-Member -MemberType NoteProperty -Name "Modified" -Value $spolItem.Modified
            $configurationObject | Add-Member -MemberType NoteProperty -Name "Created" -Value $spolItem.Created
            $configurationObject | Add-Member -MemberType NoteProperty -Name "Author" -Value $author.Title
            $configurationObject | Add-Member -MemberType NoteProperty -Name "Editor" -Value $editor.Title
            $configurationObject | Add-Member -MemberType NoteProperty -Name "TenantWideExtensionComponentId" -Value $spolItem.TenantWideExtensionComponentId
            $configurationObject | Add-Member -MemberType NoteProperty -Name "TenantWideExtensionComponentProperties" -Value $spolItem.TenantWideExtensionComponentProperties
            $configurationObject | Add-Member -MemberType NoteProperty -Name "TenantWideExtensionListTemplate" -Value $spolItem.TenantWideExtensionListTemplate
            $configurationObject | Add-Member -MemberType NoteProperty -Name "TenantWideExtensionWebTemplate" -Value $spolItem.TenantWideExtensionWebTemplate
            $configurationObject | Add-Member -MemberType NoteProperty -Name "TenantWideExtensionSequence" -Value $spolItem.TenantWideExtensionSequence
            $configurationObject | Add-Member -MemberType NoteProperty -Name "TenantWideExtensionHostProperties" -Value $spolItem.TenantWideExtensionHostProperties
            $configurationObject | Add-Member -MemberType NoteProperty -Name "TenantWideExtensionLocation" -Value $spolItem.TenantWideExtensionLocation
            $configurationObject | Add-Member -MemberType NoteProperty -Name "TenantWideExtensionDisabled" -Value $spolItem.TenantWideExtensionDisabled

            m365 spo listitem remove --webUrl $appCatalogUrl --listTitle $listName --id $spolItem.Id
            $deletedSpfxExtensionConfigs += $configurationObject
        }

        # you can add --recyle parameter to Recycle the list item
        m365 spo listitem remove --webUrl $appCatalogUrl --listTitle $listName --id $spolItem.Id --confirm
        $deletedSpfxExtensionConfigs += $configurationObject
    }
    else {
        Write-Host "Tenant Wide Extensions list is empty."
    }
}
else {
    Write-Host "Unable to get App Catalog Url."
}

I hope you find this script helpful. Let me know your thoughts in the comments section.