Hey @John_D
In this case, you should go to the wallets page and select the wallet you want to disable. Then click on the small cog and select Edit > Edit API Settings > Disable API
Let me know if this doesn’t work for you!
You can also choose to toggle the “Ingore Reported Balances” setting too. See article attached for steps on how to do this. 
https://help.koinly.io/en/articles/6129588-ignore-reported-balances-explained