Your allocated space will grow automatically, you don’t have to worry about it, that is normal. You will always see used space close to allocated space. The key is when allocated space and used space are getting close to the maximum storage size.
If you see the database size reaching the maximum size you may need to run the following statement to increase the maximum size or adjust the maximum size using Azure portal.
ALTER DATABASE AzureDB2 MODIFY (EDITION='STANDARD', MAXSIZE= 50 GB)
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