Out of curiosity, I tried to edit xnview.ini manually and changed
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formats=bmp, heic, jp2, jpeg, jpegxl, jxr, png, webpCode: Select all
formats=gif, bmp, heic, jp2, jpeg, jpegxl, jxr, png, webpModerators: helmut, xnview, Dreamer
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formats=bmp, heic, jp2, jpeg, jpegxl, jxr, png, webpCode: Select all
formats=gif, bmp, heic, jp2, jpeg, jpegxl, jxr, png, webp