"Accurately" ... ain't no such thing. All color is relative to the space it is displayed in and how treated by the player, the OS, and the screen. If you aren't running a high quality monitor that is both calibrated and profiled to check calibration to be under a deviations deltaE of 2.3, for whichever space you're working in, you can't talk "accurate".
Premiere is hardwired to work in the historic broadcast standard requirements, and is designed to be used on systems with monitors set to video sRGB, in the Rec.709 profile, white point D6500, and brightness set for 100 nits. It doesn't "auto" do anything to your color, except handle it straight up as long as you're viewing on an appropriate system.
Ann's comment about the Vectorscope YUV was spot-on. You should always be checking color hue and saturation with at least a Vectorscope and either/both RGB Parade or Waveform monitor. Your eyes are a fine relative instrument, but have no capability to accurately see color outside of relative terms.
On a vectorscope, the center is "neutral", white/gray/black.
As you look around the sort of circular shape, you see little boxes with the appropriate Primary and Secondary color designations ... Red, Magenta, Blue, Cyan, Green, Yellow, and back to Red. As the color saturation increases, colors show in the "trace" farther out towards the lines that show acceptable color excursion limits ... past that, clipping of color signal probably will occur.
Your image, on a vectorscope, is already off-center towards the yellow/orange side of things. Premiere doesn't auto-adjust, so when you up saturation, it goes all directions, but ... the areas with more inherent saturation "move" faster. With an image with so much yellow bias to the signal, yea, it gets yellow-orange pretty quick.
In the upper left of your Premiere workspace, where the ECP is showing now, click the Lumetri Scopes tab. Right-click in it, and set it for Vectorscope YUV and RBG Parade. You can see where your image has color ... and how much is on the center 'neutral' area ... in the Vectorscope. You can see relative strength of image in the three channels, RGB, and total brightness also in the RGB Parade.
There are quite a few online helps to get you going, as learning how to use the scopes will greatly improve your tonal and color work.
Also, you can check my site, there's a number of posts on what the Lumetri controls do (which is not always obvious!) and a bit on how to work with scopes is there also.
Neil
rNeilphotog – Home for Neil's video post-processing information.
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