Disabling checking out in multiple currencies doesn’t work!

I asked a separate question in another thread unrelated to this and wasn’t answered, so I guess the feature wasn’t supported so now I have to do this as a workaround but it doesn’t work. What I posted in other thread: https://i.imgur.com/qFMkYLd.png.

So to work around this issue where Authorize.net can’t charge in other currencies other than your own, I left multi-currency enabled so customers can see prices in their local currency, but DISABLED paying in multiple currencies for checkout so the price would be shown as USD and they could use Authorize.net if they wanted to, but it doesn’t disable it. Customers are still paying in their local currency whilst checking out. Even after turning that option off, I’m still getting PayPal payments from their currency instead of USD, and people who try using Authorize.net get a currency error that looks like this: https://i.imgur.com/Sa2W3uz.png.

Why is it not disabling…? Very irritating. Already tried deactivating, then activating again, clearing cache, etc. WHY WON’T IT DISABLE?

Also what does the “Enable cart page” option even do? I’ve tested it 100 times and found that it makes no difference or does anything at all.

Original thread here: https://wordpress.org/support/topic/disabling-checking-out-in-multiple-currencies-doesnt-work/#post-11398011