**Describe your environment** latest sloeber 4.4.3 product OS: Win 11 STM32 Arduino Core 2.7.1: https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json <img width="399" alt="image" src="https://github.com/Sloeber/arduino-eclipse-plugin/assets/85557472/959d175c-f988-4867-8175-519b180fe59e"> **Describe the bug** After upload, the serial monitor is not cleared, even when the checkbox is ticket in _Sloeber_ -> _Preferences_ <img width="148" alt="image" src="https://github.com/Sloeber/arduino-eclipse-plugin/assets/85557472/fb962dde-ea81-4eb1-92f5-a2429de6308b"> I have seen this on a custom board with SWD upload and on a Nucleo32 with mass storage upload **To Reproduce** 1. install STM32 Arduino Core 2. create new project with serial output 3. compile, download 4. activate serial port 5. see output 6. check _Clean Serial monitor after upload_ and Switch to _Serial monitor after upload_ in the menu _Sloeber_ -> _Preferences_ 7. upload project again 8. previous contents is still in serial monitor