I updated your code. This is the quickest way of using the default printers classes:
`uvm_info("REPORT", $sformatf("my_q[%0d]:\n%s",
i, my_q[i].sprint(uvm_default_line_printer)), UVM_LOW)
// the uvm_default_printer is the uvm_default_table_printer, you can change it globally or pass one these declared printer classes:
uvm_default_table_printer
uvm_default_line_printer
uvm_default_tree_printer
I updated your code with the uvm_default_line_printer call and it works.