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 -&gt; Language &amp; Keyboard -&gt; 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 There are instructions on the Swiftkey site that are either outdated or don't apply to my phone: the settings don't look like that. 

The relevant AE answer is 5 years old. 

LG G5
As of now all i can see is there are only 2 possible solutions 
1) keep only one keyboard as suggested in 5 year old question 
2) or keep all keyboards but disable all except for the one that you use by going to setting->language &amp; input->virtual keyboard->manage keyboards, here disable all except one that you use regularly  
Tried and tested on stock nougat 7.0 on moto g5+