Arduino for STM32

Sorry, I'm new to this forum. Is there something to do to mark this topic as "Sorted"?

Hi,
Thanks everybody for your contributions, I really appreciate.
I got it!!
Thanks to fpiSTM 's link on how to change Serial pins at sketch level.
I added:

Serial.setRx(PA10);
Serial.setTx(PA9);

Before the Serial.begin, and now I can see the messages in the serial monitor.
By the way I made a ...

Thanks for your answer, good point!
So for "USB support (if available)", it's on None
for "U(s)ART support", it's on "Enable (generic 'Serial')"
and for "USB speed (if available)", it's on "Low/Full speed"

I just made a try selecting "CDC (generic 'Serial' superseed U(s)UART)" for "USB support" but ...

Hi,
I'm new to STM32 mcus. And to start with I got this mini STM32F103C8T6 CH340 from aliexpress:
(https://fr.aliexpress.com/item/1005006910706030.html)
There is a ch340 chip on it so you can directly flash the board by pluging the board on a usb port. Works great (see below settings in Arduino IDE ...