Hi BillYoung
Thanks for posting the thread on our forum.
According to your description, it seems that you want to obtain the current logged in user name display in the SharePoint list.
If my understanding is correct, we suggest you can use the JavaScript to achieve your requirement.
Open the drop-down menu under a column>Format this column>then type the below script in the box>Save to see the result.
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"txtContent": "@currentField.title"
}
For more detailed information, you can refer to Use column formatting to customize SharePoint | Microsoft Docs
Hope the suggestion can help you.
Best regards,
Stacey