Acrobat undocumented cmd + 5 kbd shortcut?

[gordonv71838349]

I have some PDFs from a third party with quite thick lines & very poor resolution text - the supplier suggested cmd + 5 (on a Mac) or ctrl + 5 on Windows - that worked a treat; crisp thin lines & legible text but does anyone know what that's actually doing -  it doesn't seem to be documented?

Thanks

[gordonv71838349]

OK - answered my own question; it turns out that shortcut toggles line weights view on/off - when off everything renders at 1 pixel; when on it renders from the document definitions.

In my case it probably suggests an issue with the PDF creator that was used excessively beefing up all the lines & text outlines.