Any way to start in 1024 x 768 resolution?

[Contractor]

When the game starts I can't access the options menu because my mouse can't 'reach' the options icon. My projector requires 1024 x 768 native resolution. Is there a startup option or something I can use? Looked for a config or INI file for the game but can't find anything related to resolution. Just need to do this once but unable to play the game currently. TIA!

[sinespiritu]

it looks like the config is located in ~/.config/unity3d/South East Games/Probably Archery/prefs, but the changes in it did not work for me.
you can reach options by click on the place where it must be. the options icon is not displayed but the options button IS located on the correct place. I got the options screen by click this button at random.