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Please try selecting the files (and filtering off from the view the files that are not selected using 'Sort/Filter files' panel) before using 'apply to the next file'.
Selecting/marking files: https://updates.fastrawviewer.com/data/FastRawViewer2-Manual-ENG.pdf#pag...
File Filtering: https://updates.fastrawviewer.com/data/FastRawViewer2-Manual-ENG.pdf#pag...

You can access the FastRawViewer manual via main Menu -> Help -> PDF Manual. The manual is a standard PDF file, with a table of contents; and the PDF itself is fully searchable.