tkinter frame：更改其内容时修复帧高度

I am working on a self written simulation tool with a appropriate GUI. In general there are two main user modes. In the first one the user can enter several values for the desired calculation. After all calculations finshed, the user can switch to "results mode" by clicking the "Show Results" button in the lower right corner. By doing this, the main window with image in the upper part of the GUI does not change. However, the former input entries in the lower part of the GUI should change to message area, where errors, warnings or other information (duration, convergency, ...) are shown.I am working on a self written simulation tool