Perforce: new workspace won' t bring up the add folder dialogue

I went through several tutorials on youtube on how to setup a perforce server. I managed to get it running once but never again since. The main problem is that the UE4 engine doesn’ t find the workspace. But for the moment I’ m stuck with another problem. All the tutorials show how to add a new workspace followed by a window where you would point to your ue4 projects root folder to be in included in the Workspace. For me this works exactly one time and every other workspace I create doesn’ t bring up that window to add the projects root folder. I also can’ t find a way to add a folder after I created a workspace.

A tutorial I read says
…usually launch a wizard to commit an initial fileset to the depot. If not; you can mark/add them manually and submit them.

The Perforce Manual says.

To add a file to the depot:
In the Tree pane, click the Workspace tab.
Browse to the file you want to add. …
Context-click the file and choose Mark for Add. …
To submit the changelist containing the open file, context-click the file and choose Submit… …
Enter a description of the change and click Submit.

I can’ t figure out how to do this. Once I created a new workspace I don’ t see any files in the workspace Tree Pane except the empty folder I created the Workspace in. I can set the filter to “entire computer” wich show me all files. When I browse to my unreal projects root folder the “add” button in the Tab is greyed out and right click brings no option to “mark for add”

The perforce version I installed is
P4V/NTX64/2018.4/1753667
Helix Core Server 2018.2
Any help is much appreciated.

Same issue, did you ever solve this?