I am sure this is how I did it in DO11
Highlight files in lister
Click Rename
Mode Find and Replace
Next
Find String
Remove the part of name I want to Keep
Replace string
Remove everything
As below
It shows current name and new name as I want it.
Click OK
Another Rename Panel opens on top of the old Panel
No Files are remaned
Or
Click Apply
Another Rename Panel opens on top of the old Panel
No Files are remaned
Image 3
If I type say 123 into the Replace string
Click OK the files are renamed and the Rename panel goes
Click Apply the files are renamed and the Rename panel stays
onedot3