after the last upgrade folder view doesn't works

there was at least two folder view widgets on my desktop, after the last upgrade they disappeared, I tried to place again on the desktop but unsuccessfully, dragging and dropping but nothing happen.
how can I solve??

Laptop=Dell latitude E6510, RAM=8Gb, GPU=GT218 NVS 3100M, CPU=i7 Q 720 @ 1.60GHz

running opensuse leap 42.2 switched to wolfi repos
plasma 5.8.4, KDE frameworks 5.26.0,

Kernel 4.4.36-8-default,
nvidia drivers, libreoffice