Hello Larissa,
Thank you for reaching out to Atlassian Community!
When it comes to Customer permissions in the portal, currently, it's not possible to allow them to only view tickets.
If a customer is added to a project, they will be able to create and view tickets, view articles (in case a knowledge base is linked to the project), comment on tickets, and so on.
There is a feature request suggesting the implementation of such ability:
Please, click on vote and watch to receive updates about the feature.
Regards,
Angélica
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