Evolver-uses-Price-Grid-G-Gene-Code-even-when-shut-off

So you've enabled no Conditions? You need at least one Condition enabled, otherwise the Evolver will enable all of them.

In "Preferences", the only boxes checked within the Gene Roster of the Genetic Evolver was...

Buy at Market (B)
Sell after N Bars (Sx)
Sell at Market (Sm)
Smoother Crossover (Sx)

I must be missing something. I've been using the evolver this way for years.
I don't know what "conditions" you might be referring to in this case.

The Evolver uses two types of Condition Genes, Signals and Filters, as shown here. You need at least one of each enabled. It looks like you don't have any Filters enabled so the Evolver defaults to using all available Filters.