Can I amend the layout of the Expense voucher? Thank you.

Welcome to Community, @sychan.

I've answered your other post similar to the expense voucher.  If you're referring to the logo, you'll want to check out my answer in your post found in the link below.

https://quickbooks.intuit.com/learn-support/en-us/other-questions/company-logo-appears-incorrectly-on-invoice-sales-receipt-po/01/853120#M72151

On the other hand, amending the expense voucher layout in QBO isn't possible. An expense voucher form is a default form in QBO. Modifying its layout is unavailable.

As always, feel free to reply to this thread if you still have questions about expense vouchers. I'll be around to help. Take care and stay safe.