Being a long time Samsung user (17 years) I'm trying to still figure out a few things on this OP13. First, how do I clear the cache partition? And, second, how do I apply a new set of icons? TIA
Since most phones utilize dual A/B partitions for seamless updates, that makes wiping the cache partition impossible. Samsung was one of the only holdouts, which is why it was still possible on their phones. Based on the steps here shown here, it appears OnePlus doesn't have the option: https://www.hardreset.info/devices/oneplus/oneplus-13/
I'm not sure if OnePlus's own launcher has the ability to apply 3rd party icon packs. If it doesn't, you'd have to install a 3rd party launcher like Nova.