IDE seems to be corrupt

I have just joined and am still getting to grips with both the Arduino and using forums. However, lets see what this brings.
I've been using the IDE on my 2015 iMac for a couple of months while plugging through tutorials on its use. I just realised that I could increase the font size ( my eyes are not so good these days) so I changed it under preferences to 16 point and the whole editor area is now grey and unresponsive to edits at all.
Help please?

You must have forgot that you set the IDE to use an external editor while you were changing the font size.

Do this:

  • File > Preferences
  • Uncheck the box next to "Use external editor".
  • Click the "OK" button.

Brilliant thanks fixed it although I was not conscious of selecting that option I must have. Thanks again.

You're welcome. I'm glad to hear it's working now. Enjoy!