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To prevent wasting envelopes, whatever your problem with printing alignment, it is best to use the
File - Print Preview
function when your document is composed, before actually sending the print job. That will tell you
A. what your printout will look like, with current print settings and document details/content
B. whether your paper type and so forth is set up correctly for envelopes, or whether the printer will proceed to assume that you are printing on an 8 1/2 by 11 inch sheet of paper, etc.
Print Preview brings up a screen that shows what your printout ought to look like, you see.
As for printing on envelopes and finding that the address is too far down, there are two especial considerations to adjust:
1. are you placing the envelope in the printer correctly and according to instructions that came with the printer? (If you need these instructions for your model of printer, just Reply asking me for them.)
2. Top Margin settings must be reduced, possibly to 0.00, in order for the placement of the address on the envelope to be correct.
Print Preview will reflect whatever margin settings you have in place - provided you save the changed setting, the Print Preview should show the effect of the change.