I have never used Plot so I can't comment on that.
But when you print you will have options for the Printer Setup.
In there you should find settings that control the quality of the print.
These may be set to a low or draft quality by default.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11