When we design a large poster, margin lines should be thicker compared to margines of A4 sheet.
You need to edit your sheet format for that size, increasing the line weights for those lines (see my reply at how to change e thickness of drawn lines in drawing? ). Don't forget to save your sheet format after doing that (and also your drawing template if you have a separate one for this size).
What's the difference between a sheet format and drawing template? may also help.
thank you Sir
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