the format of invoice for each entity is different. the style, size, color and placement of logo and other mandatory fields like date, invoice number, HSN code etc.

Pls allow for option to customise the standard formats / templates available in zoho books.
Introduce placeholders for each field. Each of these can then be modified for its placement, shape, size, color etc etc.

Once done, this can be saved by the user for future use. Makes it standard and unique for each business.