BIP chart: keep font size but change chart size

Hi everyone,

I havew following BIP chart:

and now I'm developing a new chart using the same code, but with only 4 bars.

Since its size has to be smaller, the number in the axis are also getting smaller.

I even had to increase barwidth to make it similar to the other one

In Word, the main chart has below size:

whereas the smaller one:

Is there an easy way so the font size is static?

in the Graph DTD Graph_DTD_Technote_2

I see a parameter called textFittingAutomatic and also fontSizeAbsolute

I have tried many combinations of them but I don't see any change.