In the next version, we'll make it so you can do this via the following commands.
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Switch to thumbnails mode, and save it for the current folder:
Set VIEW=thumbnails SAVEFORMAT=folder
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Delete the current folder's format, and re-evaluate the current folder based on the remaining formats:
Set SAVEFORMAT=folder,clear Set FORMAT=!folder
(It's important to do the first one as a single, combined line, and the second one as two separate lines. Otherwise things happen in the wrong order.)