Glad to be able to help and thanks for the feedback. I must admit I'm not sure what you have to do if you want to use a different but similarly common time signature, e.g. 6/8.
No, I tried to change the bars format and apparently you can't set a ternary rhythm. 3/4 is still binary.
But I've finally found a way!!! In the MIDI "editor" panel, you can change the grid quantization value, and by this are allowed to split the beat in three, six, etc. parts! This is ternary 😅