How do I get the "Change keyboard" notification to go away for more than an hour?

I have Swiftkey installed. I get a notification all the time about choosing my keyboard. I can get it to go away for a short time by selecting Settings -> Language & Keyboard -> Current keyboard Then selecting Swiftkey. But the notification comes back 30-60 mins later (I haven't timed it). How do I get this to stop showing up? [There are instructions on the Swiftkey site](https://support.swiftkey.com/hc/en-us/articles/201644832-I-keep-getting-a-notification-saying-Choose-input-method-) that are either outdated or don't apply to my phone: the settings don't look like that. [The relevant AE answer](https://android.stackexchange.com/questions/19566/how-do-i-disable-the-select-input-method-notification) is 5 years old. LG G5