An Object’s color as shown in Viewport Solid shading can be set in Object Properties > Viewport Display. If you right-click on that color there’s an option to Reset to Default Value, a white that’s also the default color of newly Added meshes. Can this default value be set to something else in Preferences? Where?
This post to bring up the topic’s infobar.
Loop Cut Indicator Color & Width - Preferences Settings in 3.0?
I believe if you want to change the default color you need to do it in the source code and re-compile.
How to change Default Object Color in Source Code? - Blender Stack Exchange
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That was fast – thanks!