Unfortunately there is no way to change the default setting.
Personally I create projects (folders and files) manually. Using the VS Code snippets feature, this is really fast. I need 15 seconds to create a blank new ESP32 project.
Here are my steps:
create a project folder, right click on the folder and chose “open with code” to bring up VS Code in this particular folder (not shown in the video below).
create a platformio.ini file
type “platformio” and press [enter] and save the file [ctrl+s]
create a src folder
create the src/main.cpp file
type “adc” and press [enter] and save the file [ctrl+s]
click the PlatformIO button to initialize and startup PlatformIO