JackBNimble

How can I specify a windows size other than the small, medium, and large presets in ExoDos? Medium is 1080, Large is 4k, but I have a 1400/2k monitor. More to the point, I'd like to play Pool of Radiance with the Goldbox Companion with the upper toolbar but without the side map, which means I'd like a game window that's just a little bit smaller than my monitor resolution. I'm new to the forum and I apologize if this isn't the correct place to ask this; I did also find an earlier post that suggested the option is available in the alternate launcher, which I did load on my PC, but I couldn't find any resolution options within it.