How to set form view Assign button to read and write by default?

Hello Everyone,

when i assign a Purchase Invoice to a user in Erp i get this notification ( Shared with user [xx@abc.com] with read access.

how can i make default assign with read and write ?
Basically i want that when i assign that P.I it gives the Read and Write permission by default.
Also i know that there is a share doc option left downside, but i don’t want to use that as we need to select the tables in it .

Thank You

Any help ?