Hi @Brijesh_Verma
Welcome to the community!!
It looks like the Data Explorer may be turned off for the Project the cluster resides within. Please refer to the following documentations to disable/enable the Data explorer.
Also, please note that to enable or disable the Data explorer tab, you must be Project Owner for the project or Organisation Owner on its parent Organisation.
Please refer to the attached screenshot to enable the Data explorer.
Thanks
Aasawari