You can change it from Partner form, Open your company partner and then from Accounting tab, you can add and remove bank accounts under bank accounts group as you can see in the below image.
Note: If you have multiple bank accounts, you can drag and drop the bank account (you want to use as default in invoices) to the beginning of the list so Odoo will use it as default bank account in invoices.
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Matija Amondi
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The key is in the ordering of Bank Accounts
Go to Contacts > Configuration > Bank Accounts and for your company drag the bank account that needs to be default in the first place (screenshot only for reference)
You can change it from Partner form, Open your company partner and then from Accounting tab, you can add and remove bank accounts under bank accounts group as you can see in the below image.
Note: If you have multiple bank accounts, you can drag and drop the bank account (you want to use as default in invoices) to the beginning of the list so Odoo will use it as default bank account in invoices.