I tried the following methods, it works.
(1). I added a Boolean attribute "isShow" to the Entity
,and set it’s visibility as follows.
(2). "Microflow Timer" config : execute "Microflow" every two seconds.
(3). In Microflow, I Changed "isShow.value" = not(isShow)
and set “Refresh in Clinet”=Yes
Are you sure you're refreshing the right object? Does nothing happen when you refresh the page parameter?