Is there an option that my signature is NOT shown?

I like to put my signature occasionally, but it keeps popping up even when I think it’s switched off (usually after I make a change to my text…)

Is there a disabling option?

If you’re using the newer theme, the checkboxes to show your signature in replies is checked by default.

Moved to ATMB from GQ.

Today, or perhaps yesterday, I noticed that ‘Show your signature’ is now unchecked for me by default.