Hey @Kinga Kubijk
Welcome to Atlassian Community !
Yes it is possible, but whole point of JSM is built on request types and issue types. In case the tickets are raised from customer portal then the request types wont be shown to the customers leading to a disaster for them. In case if there SLA's, Automations running on the "Request types" then removing them would break those SLA's and Automations. I would recommend to review the request types list and remove the ones which are not required rather than removing all.
To remove the requests types shown there Navigate to "Project Settings" --> "Request Types". There you would see the request type categorized as Incidents, Service Requests, Changes, Problems. Under each category there will be a request type. You can review them and remove by clicking on the three dots to right end of the request type --> "Delete Request type".
Make sure that there are no tickets in that request type before you delete them, that is change them to suitable request type before removing the request type.
Hope this helps !!
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