How can I disable Shop Pay installments without removing Shop Pay?

[Jace2]

Hi! In the checkout section of my store, I see an option to pay with shop pay: Pay in full or in installments

I want to keep shop pay but I want to get rid of shop pay installments. I tried doing so by going to settings, payments, and turning off shop pay installments, but keeping shop pay on. I went back to my store and now shop pay is gone altogether even though I just turned off installments, not shop pay itself. I am using the refresh Shopify theme. I assume this needs some coding so please explain deeply where to put the code that you give me-I am not good with coding.

I will attach a google doc with screenshots of all things relating to this problem.

https://docs.google.com/document/d/1SDzMdhd8s4nT9-EqRwtww6kAOJfgiUpXmHCNfcCrFlI/edit?usp=sharing

Please help! Thanks so much