Hi @helpmewithflow,
I did a test later and found that it is actually written with Expression. The reason why it is displayed is different from the existing flow, because you need to save the flow first, then refresh the page, or re-open the flow, the display is the same.
But essentially it is still expression.
You could place the mouse over the corresponding Value, see what its expression is, then type it into your own expression, then click ok.
Although it shows the Fx icon style at the beginning, after you save the configuration, refresh or re-open the flow, the display will be the same as the existing flow, shown as below:




Please take a try and let me know if issue still exist.
Best Regards,
Barry