Go to the following place...
Design tab > Modify Morph > Modify Segmentation...
Play with those settings.
What worked for me was that I unchecked Double Segments, then I rechecked it. That seemed to make a less segmented curve with the Morph.
>ArchiCAD 23, 7000 USA FULL
>iMac, 27-inch, 2020, Processor: 3.8 GHz 8-Core Intel Core i7, Memory: 64 GB 2667 MHz DDR4, Graphics: AMD Radeon Pro 5500 XT 8 GB