I love KDE but i have again problems with Dolphin. I have set up a few remote folders which i wanna acess via visual studio code. but they are not shown even when the setting show only in KDE is unmarked, What can i do ?

I'd guess that the remote folders are being viewed in Dolphin using some kind of url e.g. ssh://path/to/remote/folder? KDE apps use KIO to handle network transparency of files - the files just use urls like these and KIO takes care of the details of the network.
Currently KIO doesn't provide mount points for these paths, so they are only usable by other KDE applications (that use KIO); however there is a Brainstorm request to update KIO to provide mount points (similar to gvfs), so that other applications can benefit from KIO's network transparency.

A couple of workarounds include using Fuse or something to manually mount the remote directory somewhere on the file system or just copy the files locally, edit them and then copy (rsync) them back (with enough duct tape and bailing wire, you could even make that part all automatic, though using Fuse to mount them would be preferred).