This is the LIghtroom Classic forum but the answer is easy. In Lightroom mobile, you cannot turn off "coach marks" or dialogs directly, as no such setting exists in the app. The on-screen prompts are designed to introduce new features and guide first-time users. They will automatically stop appearing once you have viewed and interacted with them.
So what is the correct fourm for LR mobile? The Cloud based?
And no, they are not going away after interacting with them. They keep showing up. And why are they appearing out of the blue? It's not as if I'm LR mobile for the first time or that maksing is a new feature.