SharePoint Online: Delete List using PowerShell CSOM

• Click on Site Settings gear >> Select Site contents from the menu.
• On the site contents page, Hover over the list or library that you want to delete and then click the drop-down menu icon (…)
• On the menu that appears, click on "Remove" link and then confirm the prompt to send the list to the Recycle Bin. 
• Alternatively, you may remove a list or library in SharePoint online by going to list settings >> Click on "Delete this list" under Permissions and Management group.

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"

#Set Variables for Site URL and List Name
$SiteURL= "https://crescent.sharepoint.com/sites/pmo"
$ListName="Projects"

#Setup Credentials to connect
$Cred = Get-Credential
$Cred = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.UserName,$Cred.Password)

Try {
    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
    $Ctx.Credentials = $Cred

    #Get the List
    $List=$Ctx.Web.Lists.GetByTitle($ListName)

    #Delete the list
    $List.DeleteObject()
    $Ctx.ExecuteQuery()

    Write-host -f Green "List Deleted Successfully!" 
}
Catch {
    write-host -f Red "Error deleting list!" $_.Exception.Message
}