Bug? Unwanted auto-correct with share value

OK, very disappointed to hear this if I’m honest as I don’t want to end up with fractional shares, accidentally or otherwise. This means I’ll perpetually have to keep a balance behind if I want to avoid that.

Is there any way to switch off fractional shares for my individual account? That way I could still buy when the display sets to 2.1 while at the same time making sure the actual purchase would only be 2 shares.

If it isn’t possible to switch off fractional shares, could this feature be developed?