Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window layoutlib-native-macosx-2022.1.1-beta4-f5f9f71.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.