SVG

Hi There
Can someone please explain to me how to control SVg sizes?
Why is it that the column name changes the size of the svg?
Is there a way to stop this from happening, so that the size of the svg remains the same regardless of the column name…

here is an svg with a column name then when i change the column name to something larger:

it turns into this, and the svg hasnt changed at all…
Hope someone can help me
Thank you