I believe I mistakenly had configured my project to ESP-IDF. How do I turn to Arduino platform?
At least I thought so because of this in the bottom bar:
platformio.ini:
; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[env:lolin32]
platform = espressif32
board = lolin32
framework = arduino