In DD3, I'm using the 'Add Room' command. When I try to select any of the Fill style's (Floor - background, Floor - foreground or Wall) the dropdown box is not wide enough to be able to see the full name of each of the styles.
If, for example, I want to choose a Wood Floor Style all I see is the words 'Wood Floo' which is not enough information for me to pick the specific item I want. See attachment for full details.
Unfortunately nothing you can do on your end, the dialog would have to be redesigned. The order of the items should be in the same order as the main fill style dialog though, so although cumbersome, you can get some information that way, and also through the preview.
Thats how I manage it. Or just map a sample room on the dungeon i want to draw, small one. If its the wrong one, I just 'undo' and try again. The preview window does help in many cases, but not all of them.