You can access the webmail login Sogo for example test@test.com
You select the option of ... "Compartir/Shared".
user test@test.com shares its folders with user test1@test.com with full permissions.
You can access the webmail login Sogo for example test@test.com
The shared folder of test@test.com is not visible in the options of test1@test.com

Expect result: shared folders should be displayed for the user test@test.com