My crystal ball might be broken because it won't tell me what module you are using. But for some reason I think you are doing Tk GUIs, tkguifan. Just a huncht. But please do think about giving more information next time.

So, on the topic of expansion, the documentation says:

If a master window is so large that there will be extra space left over after all of its slaves have been packed, then the extra space is distributed uniformly among all of the slaves for which the -expand option is set. Extra horizontal space is distributed among the expandable slaves whose -side is left or right, and extra vertical space is distributed among the expandable slaves whose -side is top or bottom.

-side => 'left' and -side => 'right' might do what you want. If not, you will probably need to give more information.

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