If you are using a widescreen utility in the SH3 game, one way to get around the issue Von Vorbork is to remove the D3D files from the game's root folder. It would be best to make yourself a "mini-mod" folder in the MODS folder, like "D3Dfiles" or whatever, then cut the two files "d3d9.dll" and "d3d9.ini" from the game folder, and paste them into the "D3Dfiles" folder in the MODS folder for later re-activation. After those two files are out of the game folder, the Sh3MissionEditor will usually run OK, full screen. Dependent upon your computer, you might have to fiddle with the Compatibility settings on the Properties for Sh3MissionEditor.exe, but usually not. Note that some apps might prevent JSGME from removing the d3d9 files when de-activating the D3Dfiles mod, so if that happens to you, close Discord and/or your browser, possibly the File Manager, and they might then remove... The 'modern' Windows does not care to know how to deal with older DirectXv9 games, especially 4:3 games "stretched" to 16.9...
