I like using "#"s when answering a numbered question. Why does the # make everything big and bold and screw up formatting? Can we change the default editor formatting?
It's the Markdown syntax for header styles. See https://diy.meta.stackexchange.com/editing-help#headers
Use a backslash '\' before the '#' to make it act like a number sign.
#1 Doesn't work becomes:
1 Doesn't work
\#1 Does work becomes:
#1 Does work