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I found ANTLR to be a bit confusing for a newbie, and here is my explanation of how I got it work in IntelliJ 2020.3.

Installing ANTLR

Open IntelliJ, navigate to plugins, install antlr4. Restart IDE.

Add ANTLR JAR to modules

While in the ANTLR project, navigate to file -> project structure -> modules -> dependencies Add Antlr.runtime jar path (I searched using This PC) to modules and make sure to set to compile time.

Configuring ANTLR

Right click on your .g4 file and click configure ANTLR. Add generated Antlr grammar files to your source code (put them in src file with a name of your choice to the package so they are visible to your implementations of the generated antlr files). After this, click on generate ANTLR Recognizer to generate those ANTLR files.

Happy Coding!