How to modify ‘post_type’ and default to ‘post’?

<font _mstmutation=”1″></font>There is a field called “post_type” in the post table in the database. After upgrading to WordPress version 6.3, for some reason, if the attribute of “post_type” is not specified when publishing articles through the interface, it will be assigned the default value of “page”. What I need is “post”. Please ask where to modify it and default to “post”