database/migrations/2018_04_09_17054701_add_ui_settings_to_ltm_user_locales.php
public function up()
    {
        $prefix = \Config::get('laravel-translation-manager::config.table_prefix', '');
        Schema::table($prefix . 'ltm_user_locales', function (Blueprint $table) use ($prefix) {
            $table->dropIndex('ix_ltm_user_locales_user_id');

            $table->unique('user_id', 'ixk_user_id_users_id');
            $table->text('ui_settings')->nullable();
        });
    }
public function up()
    {
        $prefix = \Config::get('laravel-translation-manager::config.table_prefix', '');
        Schema::table($prefix . 'ltm_user_locales', function (Blueprint $table) use ($prefix) {
            $table->dropIndex('ix_ltm_user_locales_user_id');

            $table->unique('user_id', 'ixk_user_id_users_id');
            $table->text('ui_settings')->nullable();
        });
    }
Run the migrations.

@return void