Can different adresses from the same wallet be connected to each other in some way?

I know that from the Blockchain alone the adresses can’t be connected, but i have some questions about this:
Are different crypto addresses completely separate in Trezor Suite?
When I start the Trezor Suite app, are all addresses automatically requested from the network or only when I click on an address?
Do all addresses use the same API key or other identifier when requesting their balance or sending transactions?
For privacy reasons, I want to prevent my addresses from being connected to each other.