Text Favorite Manager - how do I copy and edit a text favorite?

I am using OpenRail Designer V.10.07.00.56 (only because Text Favorite Manager has disappeared from ORD U4).

I have copied a Text Favorite (that I created in 2018) using Text Favorite Manager, and I would like to change the format etc.

But even though I change what I want, click Accept and Save, the changes do not show in the top window (only in the Preview below) and the settings revert to Default (% instead of Per Mille).

What am I doing wrong?

By the way: why has Format drop-down text "Per Mille" changed to "Per Mile"?

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