From the Extensions menu → Manage Extensions command → Invoices you can see the list of the available layouts and you can install the ones you prefer.
Banana Accounting Plus can use all the invoice layouts of Banana 9 and all those created specifically for Banana+, which have more customization possibilities. We therefore highly recommend
- The CH10 layout for all users in Switzerland (with or without QR invoice)
- The UNI11 layout for all users from other countries
Advanced users can also create their own invoice layouts (see Developers Documentation).