Custom Fields' Positioning on Sales Invoice

It uses almost five rows for two custom fields and their values. There is plenty of extra white space on the right side. I want to use smaller size printing paper when I have only one item in the invoice, so I want to show/print those two custom fields on the same row, how to do that? Anyone has any idea, please help! Even I can adjust two more fields of the same size in one row. See image below, red box is what Manager shows, orange box is what I want…

This is not a coding forum. Custom themes are your own responsibility. If you do not have the skills, hire a local programmer. Any competent web developer should be able to do the job. Just find one with experience with Liquid.

Thanks for your quick reply, Tut.