Hi,
Why doest it not work ? It does not hide the element as expected.

Hi,
Why doest it not work ? It does not hide the element as expected.

Because this is a dynamic attribute which expects a dynamic expression. none is not a dynamic expression.
If you want to hide an element, use the display properties in App Structure properties.
Thank’s, it works like this now:
dmx-hide="menu_hidden.value.M_100_EMPS==1"