Just like the title says, I'm trying to change the font size in Notepad++ to what it should be.
I don't know why it's so huge.
You can check out the "Reduce" option in Settings > Preferences > General > Tab Bar (section).
In Notepad++ (6.5) the size setting for tab labels is in Settings > Preferences > Tab Settings, although this appears to be a setting for formatting within documents.
Hopefully one of those settings will help.
You can also change the size of font in Notepad++ by holding Ctrl + scroll with mouse wheel.
This is done in the Style Configurator:
Enable global font size
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