While the window has (from a users point of view) fixed dimensions and no scrollbar available, the lines with text and buttons are not always displayed completely.

The window dimensions expand or shrink according to the length of the line to display for each sub selection. This works not always flawless.

Attached is a .jpg with two screenshots for as it is (upper part) and as it should be (lower part).

Suggestion: make the window dimensions user adaptable and correct the algorithm to define the required space.