Could you provide examples of valid math code that starts with “=” or “>” ? I think that those shortcuts are made under the presumption that you would never start a command with those characters.
What Hans says has clarified the matter for me. If I start a clean book writing codes it doesn’t happen.
Now I have identified that the problem occurs to me after I add titles and sections, with the writing assistant palette.
Here I add an example, where I put titles and sections. Then I started writing a simple code
Solve [x + 1 == 0, x]
Then again when I put the = symbol it start to change the cell style..
This time I understand your issue! You said you are running v12.3.1 but your image shows you are running 12.1 instead. You must upgrade. There was a bug in 12.1 first release that when you type an = sign, it does the freeform input instead.
Thank you very much Neil, indeed I was wrong in the version that I said I had! Now I updated it to 12.3 and the problem no longer occurs. Again thanks.