What's an idiom for making something too obvious?

Telegraphing: per the OED:

To give an obvious hint or premature indication of (something to come). Also with that-clause as object.

• Chicago Tribune 21 May (Midwest ed.) ii. 3/4 'The projected titles sometimes telegraphed the jokes before the performers actually sang them.'

As explained by the Literary Agent, Rachelle Gardner:

Foreshadowing is when you purposely drop tiny hints about what’s going to happen later in the novel, to heighten the effect or the suspense. It might not even be a hint, but an image or idea that thematically relates to whatever’s going to happen later. It’s like subtle shading to plant tiny, even imperceptible, seeds in your reader’s mind.

Telegraphing is giving away too much, too soon, thereby ruining the suspense, or the impact of the event.

https://rachellegardner.com/foreshadowing-vs-telegraphing/