I mean in my opinion this shouldn't be under "internet" in the first place that's just messy, but I'm glad I stumbled upon it. I had just accepted that I'll reset my phone.
You can choose which SIM you wanna access its settings from the "internet" page. Go to settings > network & internet > internet. Or simply from the swap down menu hold on Wifi to go there directly. It'll show both SIMS like this:
