You should consider uninstalling the IDE (https://support.arduino.cc/hc/en-us/articles/360021325733-How-to-do-a-complete-uninstall-of-the-Arduino-IDE ) and installing the newest version 1.8.16 (https://www.arduino.cc/en/Guide)
You should consider uninstalling the IDE (https://support.arduino.cc/hc/en-us/articles/360021325733-How-to-do-a-complete-uninstall-of-the-Arduino-IDE ) and installing the newest version 1.8.16 (https://www.arduino.cc/en/Guide)