Yes, you can. Just tap on your account logo on the home screen. You can then tap on the account logo again and you will have the option to remove your account. There are also three dots in the top right of the screen on the account page. If you tap on them, it will have an option to remove the connected account. Simply tap that, save and you're all done.
You can also click the cog on the home page and click ‘Manage Accounts’. You can then click the dots here and remove the accounts.
Please do be aware that removing account removes all transaction history and if you were to reconnect the account all of the previous work done (bills, transaction categories etc) will be lost.