Hello Parthiban,
If your program doesn’t use all the mbed “features” then you can remove the unneeded ones using the .mbedignore configuration file.
You can find an example in this thread. (The latest .mbedignore file is available in the last post of that thread.) But keep in mind that the “features” indicated in the example are not fully independent of each other. It could sometimes happen that if you add some “feature(s)” by comment out the corresponding entry/line then some other “feature(s)” should be added (by commenting them out) too to make the program functional.