Go to Preferences -> External Editors, find the Code editor, click Browse, select Visual Studio Code, click Apply changes, and restart LateralGM.
Open the script or Execute Code button in the object after reboot, click Open with external editor.
After opening Visual Studio Code, you need to select the language manually. You can use GameMaker Language (GameMaker 8.1) and GameMaker Language (GameMaker Studio) (LateralGM does not support GameMaker Studio 2).
