What should I do after I install 128 GB of storage on my android?

I install 128 GB extra storage on my android. The thing is, most of those spaces are empty. I cannot, for example, move my most space hoarding apps over there. I can move files but I have no idea which file I should move. My phone is POCO X3 NFC I am using MKIUI Global 12.0.7 Stable Some says I should integrate the flash card with my normal ssd. However, I do not see such option in settings I installed https://play.google.com/store/apps/details?id=com.a0soft.gphone.app2sd It says I can move app but I need to format SD card as internal by going to Settings > Storage > SD card Well, in settings there is no menu called storage. It seems that in APP there should be a button that say Change. I see no such button. I can go to manage apps and I am supposed to see this I don't. My typical screen shen I click manage apps look like. See. No change button. I should format my SD as internal. I do not see any such option. I can format my SD but there is no option that it's formatted as internal.