You can specify the columns you want to retrieve in the command like given below:

    $listItems= (Get-PnPListItem -List $ListName -Fields "Title","Column1", "Column2","Column3","GUID")

Also you can use CAML query in you command, see below given references.

**References:**

1. [Retrieve SharePoint List Items Using PnP PowerShell](https://www.c-sharpcorner.com/blogs/retrieve-sharepoint-list-items-using-pnp-powershell).
2. [Get-PnPListItem](https://docs.microsoft.com/en-us/powershell/module/sharepoint-pnp/get-pnplistitem?view=sharepoint-ps).