Is it possible to turn off building thumbnails previews, when I am only viewing the filenames?

In my process, I take 20-30 raw files, then pick the best one to convert and edit.  Then when I slip into Qimage, it seems to be building thumbnails before it will let me do anything with the images.  I don't need thumbs, I can just see by the file name / type which image I want to print, but it still takes time to build them.

Can I turn it off? I prefer to not change my folder structure to accommodate not wanting to wait building thumbs.

I've had various versions of Qimage over the last 15 years, and in some of the older versions when I print to file, it added a {Q-P} prefix or a Q-P prefix, and would ask if you wanted to delete those files before printing new files into the same folder as those files.

The current version still asks if you want to delete the files with the prefix before you print new files into that folder, but it isn't adding the prefix so files are starting to build up.  How do I edit the prefix? I want Qimage to ask me if I want to delete files with the prefix every time I print new files to the same folder.