Cannot set minimum width

I've had this problem for a long time, I don't know when was the first time I noticed but today I'm determined to fix it.

Basically, I cannot set the minimum/maximum width of buttons with text:

   

I've played with the various obvious settings under [undefined=undefined]TLB Settings... > Menu > Sizes[/undefined] but the labels remain truncated, why?? Minimum Width does nothing to the width, I don't understand.

Thanks in advance!