My test bed is DO12 with the Default Format unchanged from the as-shipped default configuration, so all column width settings are Auto. If I select a few items and then Select NOPATTERN HIDEUNSEL the name column does not resize to reflect the remaining visible items. Likewise, if I then resize manually with Set AUTOSIZECOLUMNS and then click the Show Everything button, no auto resize is performed. This may be working as designed but to me, Auto means resize as appropriate following any change to the list of visible items.
I see from [url=https://resource.dopus.com/t/do12-set-autosize/22247/1], which may be related, that changes are planned for 12.0.5 so maybe this will be addressed.
Regards, AB