It is a tools menu called Action in LN Web UI. I attached an image so you can see what it looks like. However, this Action tools menu does not exist in BECS(Worktop). I mean it has its session and all but there is no menu or anything similar to this in LN Web UI. The closet thing it has is to print normally and choose preview option. I couldn't do that with AFS either.
In addition, I asked Infor Extreme Support about the DOCMAN device. He told me that this device specifically cannot be scripted to print as device DOCMAN because BECS(Worktop) cannot even handle the device. Device DOCMAN can only be used in LN Web UI on LN 10.3 or higher only.
So, in this case, I want to reduce the scope just to be able to print the preview with other normal device such as D, PDF, and SSRS. Don't bother with DOCMAN anymore. (but I really need that if it is somehow possible)