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A schema is an organizational layer to better structure your SQL database. At installation, you may only choose 1 schema:
If you’re not using specific schemas, you don’t have to fill this advanced option.

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Forest can display collections from multiple schemas

To achieve this, proceed to install using 1 of your schemas. Only the models of this schema will be generated in your models directory. Let’s take a model example: 
// This model was generated by Lumber. However, you remain in control of your models.
// Learn how here: https://docs.forestadmin.com/documentation/v/v5/reference-guide/models/enrich-your-models
module.exports = (sequelize, DataTypes) => {
  const { Sequelize } = sequelize;
  // This section contains the fields of your model, mapped to your table's columns.
  // Learn more here: https://docs.forestadmin.com/documentation/v/v5/reference-guide/models/enrich-your-models#declaring-a-new-field-in-a-model
  const Addresses = sequelize.define(
    'addresses',
    {
      addressLine: {
        type: DataTypes.STRING,
        field: 'address',
      },
      addressCity: {
        type: DataTypes.STRING,
      },
      country: {
        type: DataTypes.STRING,
      },
      createdAt: {
        type: DataTypes.DATE,
      },
    },
    {
      tableName: 'addresses',
      underscored: true,
      schema: process.env.DATABASE_SCHEMA,
    }
  );

  return Addresses;
};
On line 24, you’ll notice schema: process.env.DATABASE_SCHEMA. It uses the environment variable DATABASE_SCHEMA set in your .env file.
You’ll have to edit this to match your schemas. For instance, if you have 2 schemas: 
DATABASE_SCHEMA_1: name_of_the_first_schema;
DATABASE_SCHEMA_2: name_of_the_second_schema;
Once this is done, follow those steps:

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Step 1: Edit your current models

Because you have changed your environment variable name from DATABASE_SCHEMA to DATABASE_SCHEMA_1, you need to update it in all your models’ file in the models directory (same line as line 24 in the above example).

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Step 2: Create new models

For each of your other schemas’ models, you’ll need to create a file in models. This must be done manually and the schema line must be set to DATABASE_SCHEMA_2 as per above example.
If your other schemas have a lot of models, a quick way to generate the models is to create a another project using those other schemas (1 project for each schema).