Not all characters of address are showing when I click 'Display Address' on Ledger

This is fixed when updating the ETH application from Ledger Manager.

You can learn how to do this here: https://ledger.zendesk.com/hc/en-us/articles/115005165409-How-can-I-update-my-Nano-S-

If that doesn't work, you may need to delete the application and install it again.

Before you update or delete the application, ensure you have properly backed up your 24 word recover phrase for your Ledger and have it handy in case you need it.