If you can't already, you need to contact your admins to ask how this has been configured. That can be in all kinds of ways, so it would be a guess without knowing your instance setup.
It could have been done via ACL, query BR's, etc. But: if your setup prevents you from seeing anything besides your own tickets, there is probably a reason for that.
If my answer helped you in any way, please then mark it as helpful. If it resolved the issue, please mark it as correct. This way others will find it in the solved queue and helps them on similar queries.
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Please mark any helpful or correct solutions as such. That helps others find their solutions.
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