Created objects look brown/grey

Hi! Whenever I create any 3D objects, they appear a dull brown/grey color instead of the usual bright white. I'm using Unity version 2019.3.12f1
Is this an update or is something wrong with my settings.
This is what happens when I create any 3D objects:

 

Do you have any lights in your scene? PostProcessing Volumes?

 

I have a directional light. I'm still getting used to Unity so I'm not very familiar with what PostProcessing Volume.
Here's an image of what my directional light's settings are.

 

Notice how the "Color" of the light is the same color as the objects in your scene. The color of white objects will be influenced by the color of the light that shines on it. If you change the light color to white then the yellow hue should be removed from your objects. If the scene is still too dark, you can increase the "Intensity" of the light to make it stronger.

You can also brighten the scene by adjusting the environment lighting in the lighting settings window:
https://docs.unity3d.com/Manual/lighting-window.html

If you light your entire scene with a directional light, it can look stark, but if your shaded areas are too dark, you can easily soften them by increasing the overall environment light level.

Once you get the lighting to look like you want, then you can use post processing to fine-tune the overall look:
https://docs.unity3d.com/Packages/com.unity.postprocessing@2.3/manual/index.html