Hi Fabrício,
This is a expected behavior with Azure Storage Explorer and others tools to query it , so only allows you to view up to 32 messages in a storage queue at a time.
The maximum number of messages that may be retrieved at the same time is 32.
This is a limitation from the REST API itself. If you want to fetch more messages, you would need to make multiple HTTP requests with each request asking for a maximum of 32 messages from the Storage Queue service.
https://learn.microsoft.com/en-us/rest/api/storageservices/get-messages
Luis