How to Invoice Size Customize : Like A4 1/2
@Mohammad_Hasan_Uddin Waht do you mean by A4 1/2. I thik u mean A5 size. For that just select A5 page size while printing. Invoice will be automatically resized
Thank you 
But How to Invoice Sl Number Showing
Depending on your operating system, this may not be true. On macOS, for example, only some paper size selections in the print dialog have any effect at all when using the Print button, and most of those produce distorted results. Manager really only directly supports two sizes: A4 and US Letter. These it picks up from your Email Settings selection and uses when you use the PDF button.
Of course, after a PDF has been generated and saved, you can do anything your operating system and printer drivers allow with the resulting image.
Can you explain further what you mean? The invoice number shows automatically.
I don’t use Mac, I m using Windows and printing A5 size invoices from last 2 years and manager does it seamlessly