Current questions and answers regarding the map editor.

Guys, does anyone know if there's a command in the map editor that completely removes a selected object? In my case, it's the "fire glow" effect; I've added a lot of them, but they don't appear in the game. I hope it's possible to delete them all at once, because picking them out one by one is not an option...

I'm afraid you'll have to pick them out one by one, or open the map with an archiver, find the map.xdb file, open it with a text editor, use the search function to find these effects, and delete everything from the opening tag to the closing tag, which contains the effect. I haven't tried it myself, but I think it will work.
Or, in the editor, use the search function (the button with the binoculars icon), enter the name of the effect, click on each one, and delete it.