In RSTAB/RFEM, I have defined a tapered member consisting of two different cross-sections. In the rendering mode, it is displayed incorrectly. What did I do wrong?
A "continuous" taper is drawn if both member ends have the same cross-section type (cross-section row).
Therefore, you can replace the cross-section with the smaller depth by a cross-section from the same cross-section row as the cross-section with the greater depth (and, if necessary, adjust the depth for special cross-sections).
The easiest way to do is when you model both cross-sections as welded sections.