This is probably caused by missing rights/permissions of the account you are logged in with. Should the user have permission to search? Then follow the instructions below to adjust the rights.

To adjust the rights of an account, go to Settings → Access in the Admin. Click on ‘Users’ and search for the email address of the account in question. Click the arrow next to 'Edit' and 'Assign roles'. Check which roles are assigned.

In case a role is missing, select it here. The rights of this role have now been added to the user.

Is the role that should provide access to the search function already checked? Then go to Settings → Access → Roles. Click 'Edit' for the relevant role. Check 'Search' in the POS category.