How do I delete Gmail app labels

I set up several labels in Gmail web version in my browser on my PC. Worked fine. I then saw the same list replicated in Gmail on my Samsung Android phone. Great so far. I have tried removing a label on my PC Gmail and after refreshing it disappeared from the label list as expected. However it is still there on my phone even though it is empty (no emails). I also tried hiding labels on the PC unless there are unread messages. This also worked on my PC (they don’t appear) but they are also still on my phone in Gmail. How can I sync my Gmail app with my Gmail on my PC to have the labels list updated? Since the original list of labels was replicated from the PC to the phone, won’t the reduced list also be replicated on the phone?