How to fix one of the most irritating misconfigurations in IntelliJ IDEA

I've been struggling with the most frustrating random configuration setting in IntelliJ IDEA ever.

Here it is wreaking havoc on my progress during a live demo on stage:

Infuriating!

I finally tracked it down to the following setting. NB: I'm using IntelliJ IDEA 2026.2.2.

I needed to disable the setting called Insert the suggestion by pressing space, dot, or other context-dependent keys.

Life is so much better now!