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>when i created my trezor wallet my funds appeared in some „hidden wallet“ and not the main one.
If you have a hidden wallet that doesn’t show up until you type in the passphrase, then YOU are the one that created it.
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>In which wallet will the metamask be connected?
It will be connected to whichever wallet YOU choose to connect it to. You have have as many or as few wallets as you want. If you connect to metamask with your main wallet, then the main wallet it is. If you connect to metamask with a hidden wallet by typing in your passphrase during the metamask hardware connection process, then the hidden wallet it is.