Condition visibility - Missing collection fields


I’m not sure if it’s a bug or just another odd choice.

When I try to set a condition visibility for a specific element (In this case a rich tex), I cannot find few collection fields I’d like to use as conditions.
For example, I can find “background image set / not set” condition, instead I cannot find “background colour set / not set” condition.

I want to apply this visibility condition to the rich text in the middle of the splashpage in the project liked below

Here is my site Read-Only:

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