If you are in a menu and you want to export a list to PDF, click the button Print. This will select everything on the list to be exported.
After clicking print, a new window printing screen will open and from here you can print it or save it as a PDF.
NOTE: If in the dropdown list, the print button does not appear, you can right click on the screen and there you get the option to print from the browser. You cannot export it to PDF from there.