Right now, there is, to my knowledge, no easy way to copy the IBAN of one of your accounts. The only way to get it on your clipboard is by clicking it, than clicking share, and then click Copy to clipboard, but this copies text in the following format:
"IBAN: NLXXBUNQXXX
BIC: XXX"
but I only want to copy the "NLXXBUNQXXX" part.
So I would suggest the following:
Either: clicking the IBAN number in your account copies it and only clicking the (i) next to it will open the pop-up.
Or: in the pop-up there is an option to copy the IBAN number somehow.
The first option would be faster but maybe less intuitive.