No, the dimension of curtain must be multiples of panel size to remains the fixed size. But, if you want force to the exact dimension of curtain wall (thats means archicad will calculate it self), in the setting dialog tab, search position origin, you can rearrange position by various combination of segments.

@@betritaufani5220 I found the segment position, it doesn't seem to do much and If I have a curve its hard to get the exact length.

@@duncanh6045 if it hard to make exact length, maybe you can delete the segment manually by editing in 3D mode

i am not sure about it, please lemme know if you have tried it in archicad 20 :)

1. use polyline/line to make your shape 2. cut the line (ctrl +click the line that you want to delete) 3. use slab then press space+ click the shape 4. convert as morph (right click the slab )