Hi Xuan,
@JohnnyK is correct. Mbed Studio on Desktop does not support Mbed OS 2. It is due to the compiler used in Studio (Arm Compiler 6.13). Officially supported versions are 5.12.0 and higher.
As Jan suggested the best solution is to use bare metal profile and update Mbed OS to at least version 5.12.0: https://os.mbed.com/docs/mbed-studio/current/mbed-os/bare-metal.html
Thanks,
Arek