Hi @JNT6689FU.
I can see that you're trying to see the GBP account currency to show as it is. Since we're using multi-currency in QuickBooks Online, we're unable to turn off the conversion figure USD = GBP.
That said, allowing the UK account to only pull in GBP transactions like the USD connection isn't possible or importing the CSV file won't remove the USD = GBP conversion figure. Here's how you can add transactions in a foreign currency.
I'm adding this information to learn more about multi-currency in QuickBooks Online: Multi-currency FAQ.
Please let me know if you have other concerns with transactions in a foreign currency. I'm always around to help. Stay safe and well.