IDE hangs on startup: "Error: spawn cmd.exe ENOENT"

I would be happy to look into it if you provide the exact paths.

You are welcome. I am sorry I wasn't able to get your IDE up and running.

You are correct that there is no way to move them to the bottom.

It is possible to change the size:

  1. Open the Edit menu in the Arduino IDE.
  2. Select "Increase Font Size" from the menu.
  3. Repeat the process until the size is to your liking.

Despite the menu item name, this scales the entire interface when you are using the default settings. There is an "Interface scale: > Automatic" option in the File > Preferences dialog that allows you to change the font size alone, leaving the rest of the interface at its current scale.

Arduino IDE 2.x comes with 5 different pre-installed themes:

  1. Select File > Preferences... from the Arduino IDE menus.
  2. Click the "Theme" menu.
  3. Select a theme from the menu. The IDE interface will immediately switch to that theme, which gives a preview of how it looks.
  4. Once you have selected the theme you like, click the OK button.

It is also possible to install other themes and even make your own custom themes, but this is an advanced process and not officially supported by Arduino. I think the pre-installed themes will be sufficient for most users, but if you are interested in playing with the theme system, you can learn more about it here.

Unfortunately, the debugger is not compatible with the Arduino Mega. It is targeted to the microcontrollers that use an ARM Cortex-M core, so it would be challenging to make it work with the AVR architecture of the ATmega2560. The Arduino community is capable of some amazing things, so I won't be surprised if I see someone manage to add support via a 3rd party AVR boards platform though.

When it comes to the Arduino boards based on the more resource rich microcontrollers, the possibility to configure them to work with the Arduino IDE 2.x debugger is pretty easy. Unfortunately, I haven't seen a lot of adoption of it yet.

As far as I know, only the "Arduino SAMD Boards (32-bits ARM Cortex-M0+)" of the ATSAMD21G18-based MKR boards, Zero, and Nano 33 IoT has been configured for use with the debugger. Those are some very nice boards though. The Zero is especially convenient because that board has an integrated debugger, so you just plug the board into your computer with the USB cable like usual and you are set to start debugging.