[1a] Go to Products
and [1b] click on Filter
-button on the right.
[2a] Click on Add new filter
and [2b] select Sales channel
.
[3a] Select Online channel
and [3b] select Excluded
.
You see all unpublushed products to online channel.
[5] Click on Include in sales channels
.
[6a] Select all channel you need, but make sure to select
Online channel
and [6b] click on Include products
.}
[7] Cancel
the filter or you can save the filter for quick access.