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According to the MBED forum here - https://forums.mbed.com/t/mbed-studio-gnu-arm-gcc/5429
It is currently not possible in MBED studio to change the defualt compiler.
If you use the MBED CLI instead of studio, then you can select one of 4 compiler options, and use GCC as your default.
Hope this helps
Thanks for your reply!
Yes, now I use MBED CLI when I need GCC_ARM compiler.
Waiting for MBED studio optimization.