Definitely save a copy to play with first.
The Model and Layout tabs can be assigned unique background colors. Ron's advice is reversible if all of your objects are assigned to a color = "By Layer". Just select an object you want to change and open its properties. (CTRL+1).
Then add to your selection while the properties window is open. Keep an eye on the Color property and notice that the properties will apply to all the objects you have selected. Keep adding to the selection set and when you add an object with a direct color, the color field will change to "Varies".
If all the objects look appropriate when you change the color to "By Layer", then go ahead ans select them all, set them to white like Ron said.
Then, when you're done, change them back to By Layer.
You may notice that your components and objects may contain sub-elements whose properties are not modified by the parent object color="By Layer".
For that reason, changing all the Layers' colors may work out better for you.
If the object is set to a fixed color, I usually change it to By Layer even if it needs to be moved to a different layer to please me or added to a new layer.
If you are using Autocad Electrical, then be careful creating layers and moving things to different layers as you may "break" any references to wire layers, terminal points and references.