Copy to clipboard means that you just have to paste it if you're about to send.
Copy to clipboard and copy are usual in wallets because it saves time instead of copying each character for sending balances to addresses.
Are you dumb? Why are you stating the obvious? I was asking why I have no copy button.
Regardless, I mananaged to find the answer from another place. It turns out there is a bug in the previous to last version of monero-gui, upgrading to the latest version will fix this problem.