Hi Ankur,
You should upgrade MATLAB to the latest version since MATLAB is compatible with macOS 11 (Big Sur) from release R2020b onwards.
For more details on compatibility and system requirements, at the following page, click Details in the Mac column for the release you want:
Earlier versions of MATLAB do not officially support macOS Big Sur. These versions may work, but MathWorks does not guarantee full compatibility with these releases on macOS Big Sur.