To block conversion in subfolders you should do the following:
- Go to Profile tab;
- Open settings of “Converted images will be saved …” (click on “+” to the left of the line);
- Change the value of “Convert with subfolders” box to “No”;
If you added image files located in subfolders to Image Converter Plus, setting “Convert with subfolders” to “No” will block conversion of these files.