An option to select a particular invoice, quote or other document for template- or design-editor

[n1smithy]

What version of Invoice Ninja are you running? ie v4.5 / v5
5

What environment are you running?
Docker

Have you searched existing issues/requests?
Yes

Additional context
It would be great if one could chose one particular invoice or other document when editing or creating an invoice-template or -design. So if Invoice Ninja takes the last invoice, which contains only one task (for example), one cannot check if product-items are created correctly. Same to other aspects of the designing.