Kde plasma does not remember the location of desktop icons

I would like to place each desktop item manually, possibly rearrange them to my taste, but have them stay where I put them between sessions. Locking seems to prevent me from moving either existing or newly created items. Unlocking lets them all move between sessions. Unlocking and relocking is way too clumsy, and I will just find other organizing tools instead of desktop items. If I have missed a way to do what I want, I will greatly appreciate a pointer. Thanks.