You select the RTL_433 environment in the platformio.ini file from the long list of default_envs. Uncomment the configuration you want, for example: default_envs = esp32dev-rtl_433
The user_config file sets the hw configuration based on the selected environment from ini file. Look for cc1101 in the config: #define ZradioCC1101 "CC1101" //ESP8266, ESP32

Disclaimer, I'm also new to this....

Yes, this is working for existing devices from list.
But if I want to use as sample a esp32S3 and add rtl_433 - so I can do it (like with other modules) with user_config.
This is not working for rtl_433, as far as I have seen...

This should be pretty straight forward

1 - Create your own test_env.ini
2 - From environments.ini, copy and merge a one of the rtl_433 environments with a S3 environment into test_env.ini
3 - Restart VSC
4 - Select your new environment, then build

@NorthernMan54 - I was thinking initial about Arduino IDE...
But will test your suggestion in PIO - I did not use it often before,... THANKS!

I find that the Arduino IDE is like working with one arm tied behind your back ;-(

For some reason mine just crashes over and over, but compiles fine, probably something with my spi..
Still working on it..
but heres an example of mine

[env:esp32S3BASIC-rtl_433_LOCAL]
platform = ${com.esp32_platform}
; board = esp32dev
board = esp32-s3-devkitc-1
board_build.partitions = min_spiffs.csv
lib_deps = 
	${com-esp32.lib_deps}
	${libraries.rtl_433_ESP}
build_flags = 
	${com-esp32.build_flags}
	'-DvalueAsATopic=true'
	'-DLOG_LEVEL=LOG_LEVEL_TRACE'
	'-DGateway_Name="OMG_rtl_433_ESP"'
	'-DZgatewayRTL_433="rtl_433"'
	'-DZradioCC1101="CC1101"'
	'-DDEMOD_DEBUG=false'
	'-DPUBLISH_UNPARSED=true'
	'-DSIGNAL_RSSI=true'
	'-DNO_DEAF_WORKAROUND=false'
	'-DRF_CC1101="CC1101"'
    '-DCC1101_FREQUENCY=433.950'
	'-DRF_MODULE_GDO0=7'
	'-DRF_MODULE_GDO2=6'
	'-DRF_MODULE_SCK=13'
	'-DRF_MODULE_MISO=12'
	'-DRF_MODULE_MOSI=11'
	'-DRF_MODULE_CS=10'
	'-DTRIGGER_GPIO=0'
	'-DMQTT_SERVER="192.168.100.17"'
	'-Dwifi_ssid="wifi"'
	'-Dwifi_password="password"'
	'-DNO_INT_TEMP_READING'
custom_description = Gateway using RTL_433_ESP library, need CC1101

If you add the directive RF_MODULE_INIT_STATUS it will also log the initialization of the CC1101.

Anything interesting in the logs prior to the restart ?

Seems like a memory issue NorthernMan54/rtl_433_ESP#99

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