Hello

You need to manage access rights from settings for all user

create one group and give them  restricted access rights

for

    rse.partner or product.product

You can restrict any user from creating a new product by following these steps:

- Go to: 

Settings > in "Users" Select "Manage Users"

Select the user which you need to restrict him from creating a new product.

Select "Edit" then in "Inventory" Select "User" ((Do Not Select Administrator)) then click save.

..

Settings > User & Companies > Select "Groups"

Search for "Inventory / User" then Select it

Select "Access Rights" then Select "Edit"

In the table, you will see "product.template stock user" .. 

Tick inside "Create Access" to allow users to create a new product or untick to restrict the user from creating a new product.

Regards,

Yousif Al Qallaf