How to reduce the complexity of variable information displayed by gdb?

I recently upgraded gdb from 7.12 to 8: 00, and debug found that when I display a string, the content displayed is very complicated! For example, startSym= "A"; such a simple string, disp startSym appears as follows:

>>> disp startSym
$2 = {
  static npos = 18446744073709551615, 
  _M_dataplus = {
    <std::allocator<char>> = {
      <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
    members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
    _M_p = 0x7fffffffdd30 "A"
  }, 
  _M_string_length = 1, 
  {
    _M_local_buf = "A\000\000\000\000\000\000\000\001\000\000\000\000\000\000", 
    _M_allocated_capacity = 65
  }
}

I initially searched for what I thought was the set display setting, but tried many times without success. Is there any way to get back to the dry state that I used to display only the contents of strings?

Linux cPP

Mar.21,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b37f34-4ed3c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b37f34-4ed3c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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