We have a "Full screen" option in the Player and one can resize the Player window by hand.

But it would be nice to also have a "Zoom 1:1" option in the Player so that a screen pixel corresponds to a DCP pixel.
With this option exact DCP pixel inspection would be possible/easy.
One could see how the pixels will be shown by a DCI projector and for example check things like font-rendering and noise.

Depending on the screen and DCP resolutions this might not always fit.
In this case scrollbars could be handy so that the pixels can still properly viewed
(or instead of scrollbars just grabbing and shifting/scrolling the image with the mouse)

And maybe a "Zoom 1:2" option so that one can see how a 4k DCP will be shown on a 2k projector.